EXHIBIT 10.2

                         ADVANSTAR COMMUNICATIONS INC.


                                 $150,000,000

                   9 1/4% Senior Subordinated Notes due 2008


                  EXCHANGE AND REGISTRATION RIGHTS AGREEMENT
                  ------------------------------------------

                                                      April 30, 1998

CHASE SECURITIES INC.
LEHMAN BROTHERS INC.
c/o Chase Securities Inc.
270 Park Avenue, 4th floor
New York, New York  10017


Ladies and Gentlemen:

          Advanstar Communications Inc., a New York corporation (the "Company"),
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proposes to issue and sell to Chase Securities Inc. ("CSI") and Lehman Brothers
                                                      ---                      
Inc. (together with CSI, the "Initial Purchasers"), upon the terms and subject
                              ------------------                              
to the conditions set forth in a purchase agreement dated April 27, 1998 (the
"Purchase Agreement"), $150,000,000 aggregate principal amount of its 9 1/4%
 ------------------
Senior Subordinated Notes due 2008 (the "Notes"), which Notes will be
                                         -----
unconditionally guaranteed (the "Guarantees", and, together with the Notes, the
                                 ----------
"Securities"), on a senior subordinated basis, by (i) each subsidiary of the
 ----------
Company existing on the Closing Date and each subsidiary (other than foreign
subsidiaries and Unrestricted Subsidiaries) created or acquired after the
Closing Date (the "Subsidiary Guarantors") and (ii) AHI Holding Corp. ("AHI")
                   ---------------------
and Advanstar Holdings, Inc. ("Holdings", and, together with the Subsidiary
                               --------
Guarantors and AHI, the "Guarantors"). Capitalized terms used but not defined
                         ----------
herein shall have the meanings given to such terms in the Purchase Agreement.

          As an inducement to the Initial Purchasers to enter into the Purchase
Agreement and in satisfaction of a condition to the obligations of the Initial
Purchasers thereunder, the Company and each Guarantor agrees with the Initial
Purchasers, for the benefit of the holders (including the Initial Purchasers) of
the Securities, the Exchange Securities (as defined herein) and the Private
Exchange Securities (as defined herein) (collectively, the "Holders"), as
                                                            -------      
follows:

          1.   Registered Exchange Offer.  The Company and the Guarantors shall
               -------------------------                                       
(i) prepare and, not later than 60 days following the date of original issuance
of the Securities (the "Issue Date"), file with the Commission a registration
                        ----------                                           
statement (the "Exchange Offer Registration Statement") on an appropriate form
                -------------------------------------                         
under the Securities Act with respect to a proposed offer to the Holders of the
Securities (the "Registered Exchange Offer") to issue and deliver to such
                 -------------------------                               
Holders, in exchange for 

 
                                                                               2



the Securities, a like aggregate principal amount of debt securities of the
Company unconditionally guaranteed, on a senior subordinated basis, by the
Guarantors (the "Exchange Securities") that are identical in all material
                 -------------------
respects to the Securities, except for the transfer restrictions relating to the
Securities, (ii) use its reasonable best efforts to cause the Exchange Offer
Registration Statement to become effective under the Securities Act no later
than 150 days after the Issue Date and the Registered Exchange Offer to be
consummated no later than 185 days after the Issue Date and (iii) keep the
Exchange Offer Registration Statement effective for not less than 30 days (or
longer, if required by applicable law) after the date on which notice of the
Registered Exchange Offer is mailed to the Holders (such period being called the
"Exchange Offer Registration Period"). The Exchange Securities will be issued
 ----------------------------------
under the Indenture or an indenture (the "Exchange Securities Indenture") among
                                          -----------------------------
the Company, the Guarantors and the Trustee or such other bank or trust company
that is reasonably satisfactory to the Initial Purchasers, as trustee (the
"Exchange Securities Trustee"), such indenture to be identical in all material
 ---------------------------
respects to the Indenture, except for the transfer restrictions relating to the
Securities (as described above).

          Upon the effectiveness of the Exchange Offer Registration Statement,
the Company shall promptly commence the Registered Exchange Offer, it being the
objective of such Registered Exchange Offer to enable each Holder electing to
exchange Securities for Exchange Securities (assuming that such Holder (a) is
not an affiliate of the Company or an Exchanging Dealer (as defined herein) not
complying with the requirements of the next sentence, (b) acquires the Exchange
Securities in the ordinary course of such Holder's business and (c) has no
arrangements or understandings with any person to participate in the
distribution of the Exchange Securities) and to trade such Exchange Securities
from and after their receipt without any limitations or restrictions under the
Securities Act and without material restrictions under the securities laws of
the several states of the United States.  The Company, the Guarantors, the
Initial Purchasers and each Exchanging Dealer acknowledge that, pursuant to
current interpretations by the Commission's staff of Section 5 of the Securities
Act, each Holder that is a broker-dealer electing to exchange Securities,
acquired for its own account as a result of market-making activities or other
trading activities, for Exchange Securities (an "Exchanging Dealer"), is
                                                 -----------------      
required to deliver a prospectus containing substantially the information set
forth in Annex A hereto on the cover, in Annex B hereto in the "Exchange Offer
Procedures" section and the "Purpose of the Exchange Offer" section and in Annex
C hereto in the "Plan of Distribution" section of such prospectus in connection
with a sale of any such Exchange Securities received by such Exchanging Dealer
pursuant to the Registered Exchange Offer.

          If, prior to the consummation of the Registered Exchange Offer, any
Holder holds any Securities acquired by it that have, or that are reasonably
likely to be determined to have, the status of an unsold allotment in an initial
distribution, or any Holder is not entitled to participate in the Registered
Exchange Offer, the Company shall, upon the request of any such Holder,
simultaneously with the delivery of the Exchange Securities in the Registered
Exchange Offer, issue and deliver to any such Holder, in exchange for the
Securities held by such Holder (the "Private Exchange"), a like aggregate
                                     ----------------                    
principal amount of debt securities of the Company guaranteed by the Guarantors
(the "Private Exchange Securities") that are identical in all material respects
      ---------------------------                                              
to the Exchange Securities, except for the transfer restrictions relating to
such Private Exchange Securities.  The Private Exchange 

 
                                                                               3

Securities will be issued under the same indenture as the Exchange Securities,
and the Company shall use its reasonable best efforts to cause the Private
Exchange Securities to bear the same CUSIP number as the Exchange Securities.

          In connection with the Registered Exchange Offer, the Company and the
Guarantors shall:

               (a)  mail to each Holder a copy of the prospectus forming part of
     the Exchange Offer Registration Statement, together with an appropriate
     letter of transmittal and related documents;

               (b)  keep the Registered Exchange Offer open for not less than 30
     days (or longer, if required by applicable law) after the date on which
     notice of the Registered Exchange Offer is mailed to the Holders;

               (c)  utilize the services of a depositary for the Registered
     Exchange Offer with an address in the Borough of Manhattan, The City of New
     York;

               (d)  permit Holders to withdraw tendered Securities at any time
     prior to the close of business, New York City time, on the last business
     day on which the Registered Exchange Offer shall remain open; and

               (e)  otherwise comply in all respects with all laws that are
     applicable to the Registered Exchange Offer.

          As soon as practicable after the close of the Registered Exchange
Offer and any Private Exchange, as the case may be, the Company and the
Guarantors shall:

          (a)  accept for exchange all Securities tendered and not validly
     withdrawn pursuant to the Registered Exchange Offer and the Private
     Exchange;

          (b)  deliver to the Trustee for cancellation all Securities so
     accepted for exchange; and

          (c)  cause the Trustee or the Exchange Securities Trustee, as the case
     may be, promptly to authenticate and deliver to each Holder, Exchange
     Securities or Private Exchange Securities, as the case may be, equal in
     principal amount to the Securities of such Holder so accepted for exchange.

          The Company and the Guarantors shall use their reasonable best efforts
to keep the Exchange Offer Registration Statement effective and to amend and
supplement the prospectus contained therein in order to permit such prospectus
to be used by all persons subject to the prospectus delivery requirements of the
Securities Act for such period of time as such persons must comply with such
requirements in order to resell the Exchange Securities; provided that (i) in
                                                         --------            
the case where such prospectus and any amendment or supplement thereto must be
delivered by an Exchanging Dealer, such period shall be the lesser of 180 days
and the date on which all Exchanging Dealers have sold all Exchange Securities
held by them and (ii) the Company and the Guarantors shall make such 

 
                                                                               4

prospectus and any amendment or supplement thereto available to any broker-
dealer for use in connection with any resale of any Exchange Securities for a
period of not less than 90 days after the consummation of the Registered
Exchange Offer.

          The Indenture or the Exchange Securities Indenture, as the case may
be, shall provide that the Securities, the Exchange Securities and the Private
Exchange Securities shall vote and consent together on all matters as one class
and that none of the Securities, the Exchange Securities or the Private Exchange
Securities will have the right to vote or consent as a separate class on any
matter.

          Interest on each Exchange Security and Private Exchange Security
issued pursuant to the Registered Exchange Offer and in the Private Exchange
will accrue from the last interest payment date on which interest was paid on
the Securities surrendered in exchange therefor or, if no interest has been paid
on the Securities, from the Issue Date.

          Each Holder participating in the Registered Exchange Offer shall be
required to represent to the Company that at the time of the consummation of the
Registered Exchange Offer (i) any Exchange Securities received by such Holder
will be acquired in the ordinary course of business, (ii) such Holder will have
no arrangements or understanding with any person to participate in the
distribution of the Securities or the Exchange Securities within the meaning of
the Securities Act and (iii) such Holder is not an affiliate of the Company or,
if it is such an affiliate, such Holder will comply with the registration and
prospectus delivery requirements of the Securities Act to the extent applicable.

          Notwithstanding any other provisions hereof, the Company and the
Guarantors will ensure that (i) any Exchange Offer Registration Statement and
any amendment thereto and any prospectus forming part thereof and any supplement
thereto complies in all material respects with the Securities Act and the rules
and regulations of the Commission thereunder, (ii) any Exchange Offer
Registration Statement and any amendment thereto does not, when it becomes
effective, contain an untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading and (iii) any prospectus forming part of any Exchange
Offer Registration Statement, and any supplement to such prospectus, does not,
as of the consummation of the Registered Exchange Offer, include an untrue
statement of a material fact or omit to state a material fact necessary in order
to make the statements therein, in the light of the circumstances under which
they were made, not misleading.

          2.   Shelf Registration.  If (i) because of any change in law or
               ------------------                                         
applicable interpretations thereof by the Commission's staff the Company and the
Guarantors are not permitted to effect the Registered Exchange Offer as
contemplated by Section 1 hereof, or (ii) for any other reason the Registered
Exchange Offer is not consummated within 185 days after the Issue Date, or (iii)
any Initial Purchaser so requests with respect to Securities or Private Exchange
Securities not eligible to be exchanged for Exchange Securities in the
Registered Exchange Offer and held by it following the consummation of the
Registered Exchange Offer, or (iv) any Holder so requests because any applicable
law or interpretations do not permit such Holder to participate in the
Registered Exchange Offer, or (v) any Holder so requests because such Holder
participated in the Registered Exchange Offer and did not receive freely
transferable Exchange 

 
                                                                               5

Securities in exchange for tendered Securities, or (vi) the Company so elects,
then the following provisions shall apply:

          (a)  The Company and the Guarantors shall use their reasonable best
efforts to file as promptly as practicable (but in no event more than 45 days
after so required or requested pursuant to this Section 2) with the Commission,
and thereafter shall use their reasonable best efforts to cause to be declared
effective, a shelf registration statement on an appropriate form under the
Securities Act relating to the offer and sale of the Transfer Restricted
Securities by the Holders thereof from time to time in accordance with the
methods of distribution set forth in such registration statement (hereafter, a
"Shelf Registration Statement" and, together with any Exchange Offer
 ----------------------------                                       
Registration Statement, a "Registration Statement").
                           ----------------------   

          (b)  The Company and the Guarantors shall use their reasonable best
efforts to keep the Shelf Registration Statement continuously effective in order
to permit the prospectus forming part thereof to be used by Holders of Transfer
Restricted Securities for a period of two years from the Issue Date or such
shorter period that will terminate when all the Transfer Restricted Securities
covered by the Shelf Registration Statement have been sold pursuant thereto (in
any such case, such period being called the "Shelf Registration Period").  The
                                             -------------------------        
Company and the Guarantors shall be deemed not to have used their reasonable
best efforts to keep the Shelf Registration Statement effective during the
requisite period if any of them voluntarily takes any action (other than any
action permitted by this Agreement in connection with a Suspension) that would
result in Holders of Transfer Restricted Securities covered thereby not being
able to offer and sell such Transfer Restricted Securities during that period,
unless such action is required by applicable law.

          (c)  Notwithstanding any other provisions hereof, the Company will
ensure that (i) any Shelf Registration Statement and any amendment thereto and
any prospectus forming part thereof and any supplement thereto complies in all
material respects with the Securities Act and the rules and regulations of the
Commission thereunder, (ii) any Shelf Registration Statement and any amendment
thereto (in either case, other than with respect to information included therein
in reliance upon or in conformity with written information furnished to the
Company and the Guarantors by or on behalf of any Holder specifically for use
therein (the "Holders' Information")) does not, when it becomes effective,
              --------------------                                        
contain an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading and (iii) any prospectus forming part of any Shelf Registration
Statement, and any supplement to such prospectus (in either case, other than
with respect to Holders' Information), does not include an untrue statement of a
material fact or omit to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.

          3.   Liquidated Damages.  (a)  The parties hereto agree that the
               ------------------                                         
Holders of Transfer Restricted Securities will suffer damages if the Company and
the Guarantors fail to fulfill its obligations under Section 1 or Section 2, as
applicable, and that it would not be feasible to ascertain the extent of such
damages.  Accordingly, if (i) the applicable Registration Statement is not filed
with the Commission on or prior to 60 days after the Issue Date, (ii) the
Exchange Offer Registration Statement or the Shelf Registration Statement, as
the case may be, is 

 
                                                                               6

not declared effective within 150 days after the Issue Date (or in the case of a
Shelf Registration Statement required to be filed in response to a change in law
or the applicable interpretations of Commission's staff, if later, within 45
days after publication of the change in law or interpretation or, in the case of
clauses (iv) and (v) of the first paragraph of Article 2, within 45 days of the
receipt of a request from a Holder), (iii) the Registered Exchange Offer is not
consummated on or prior to 185 days after the Issue Date, or (iv) the Shelf
Registration Statement is filed and declared effective within 150 days after the
Issue Date (or in the case of a Shelf Registration Statement required to be
filed in response to a change in law or the applicable interpretations of
Commission's staff, if later, within 45 days after publication of the change in
law or interpretation) but shall thereafter cease to be effective (at any time
that the Company and the Guarantors are obligated to maintain the effectiveness
thereof) without being succeeded within 45 days by an additional Registration
Statement filed and declared effective (each such event referred to in clauses
(i) through (iv), a "Registration Default"; provided, that a Suspension (as
                     --------------------
defined) shall not in any event constitute a Registration Default), the Company
will be obligated to pay liquidated damages to each Holder of Transfer
Restricted Securities, during the period of one or more such Registration
Defaults, in an amount equal to $ 0.192 per week per $1,000 principal amount of
Transfer Restricted Securities held by such Holder until (i) the applicable
Registration Statement is filed, (ii) the Exchange Offer Registration Statement
is declared effective and the Registered Exchange Offer is consummated, (iii)
the Shelf Registration Statement is declared effective or (iv) the Shelf
Registration Statement again becomes effective, as the case may be. Following
the cure of all Registration Defaults, the accrual of liquidated damages will
cease. As used herein, the term "Transfer Restricted Securities" means (i) each
                                 ------------------------------
Security until the date on which such Security has been exchanged for a freely
transferable Exchange Security in the Registered Exchange Offer, (ii) each
Security or Private Exchange Security until the date on which it has been
effectively registered under the Securities Act and disposed of in accordance
with the Shelf Registration Statement or (iii) each Security or Private Exchange
Security until the date on which it is distributed to the public pursuant to
Rule 144 under the Securities Act or is saleable pursuant to Rule 144(k) under
the Securities Act. Notwithstanding anything to the contrary in this Section
3(a), the Company shall not be required to pay liquidated damages to a Holder of
Transfer Restricted Securities if such Holder failed to comply with its
obligations to make the representations set forth in the second to last
paragraph of Section 1 or failed to provide the information required to be
provided by it, if any, pursuant to Section 4(n).

          (b)  The Company and the Guarantors shall notify the Trustee and the
Paying Agent under the Indenture immediately upon the happening of each and
every Registration Default.  The Company shall pay the liquidated damages due on
the Transfer Restricted Securities by depositing with the Paying Agent (which
may not be the Company or a Guarantor for these purposes), in trust, for the
benefit of the Holders thereof, prior to 10:00 a.m., New York City time, on the
next interest payment date specified by the Indenture and the Securities, sums
sufficient to pay the liquidated damages then due.  The liquidated damages due
shall be payable on each interest payment date specified by the Indenture and
the Securities to the record holder entitled to receive the interest payment to
be made on such date.  Each obligation to pay liquidated damages shall be deemed
to accrue from and including the date of the applicable Registration Default.

 
                                                                               7

          (c)  The parties hereto agree that the liquidated damages provided for
in this Section 3 constitute a reasonable estimate of and are intended to
constitute the sole damages that will be suffered by Holders of Transfer
Restricted Securities by reason of the failure of (i) the Shelf Registration
Statement or the Exchange Offer Registration Statement to be filed, (ii) the
Shelf Registration Statement to remain effective or (iii) the Exchange Offer
Registration Statement to be declared effective and the Registered Exchange
Offer to be consummated, in each case to the extent required by this Agreement.

          4.   Registration Procedures.  In connection with any Registration
               -----------------------                                      
Statement, the following provisions shall apply:

          (a)  The Company and the Guarantors shall (i) furnish to each Initial
Purchaser, prior to the filing thereof with the Commission, a copy of the
Registration Statement and each amendment thereof and each supplement, if any,
to the prospectus included therein and shall use its reasonable best efforts to
reflect in each such document, when so filed with the Commission, such comments
as any Initial Purchaser may reasonably propose; (ii) include the information
set forth in Annex A hereto on the cover, in Annex B hereto in the "Exchange
Offer Procedures" section and the "Purpose of the Exchange Offer" section and in
Annex C hereto in the "Plan of Distribution" section of the prospectus forming a
part of the Exchange Offer Registration Statement, and include the information
set forth in Annex D hereto in the Letter of Transmittal delivered pursuant to
the Registered Exchange Offer; and (iii) if requested by any Initial Purchaser,
include the information required by Items 507 or 508 of Regulation S-K, as
applicable, in the prospectus forming a part of the Exchange Offer Registration
Statement.

          (b)  The Company and the Guarantors shall advise each Initial
Purchaser, each Exchanging Dealer and the Holders (if applicable) and, if
requested by any such person, confirm such advice in writing (which advice
pursuant to clauses (ii)-(v) hereof shall be accompanied by an instruction to
suspend the use of the prospectus until the requisite changes have been made):

          (i)   when any Registration Statement and any amendment thereto has
been filed with the Commission and when such Registration Statement or any post-
effective amendment thereto has become effective;

          (ii)  of any request by the Commission for amendments or supplements
to any Registration Statement or the prospectus included therein or for
additional information;

          (iii) of the issuance by the Commission of any stop order suspending
the effectiveness of any Registration Statement or the initiation of any
proceedings for that purpose;

          (iv)  of the receipt by the Company of any notification with respect
to the suspension of the qualification of the Securities, the Exchange
Securities or the Private Exchange Securities for sale in any jurisdiction or
the initiation or threatening of any proceeding for such purpose; and

          (v)   of the happening of any event that requires the making of any
changes in any Registration Statement or the prospectus included therein in
order 

 
                                                                               8

that the statements therein are not misleading and do not omit to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading.

          (c)  The Company and the Guarantors will make every reasonable effort
to obtain the withdrawal at the earliest possible time of any order suspending
the effectiveness of any Registration Statement.

          (d)  The Company and the Guarantors will furnish to each Holder of
Transfer Restricted Securities included within the coverage of any Shelf
Registration Statement, without charge, at least one conformed copy of such
Shelf Registration Statement and any post-effective amendment thereto, including
financial statements and schedules and, if any such Holder so requests in
writing, all exhibits thereto (including those, if any, incorporated by
reference).

          (e)  The Company and the Guarantors will, during the Shelf
Registration Period, promptly deliver to each Holder of Transfer Restricted
Securities included within the coverage of any Shelf Registration Statement,
without charge, as many copies of the prospectus (including each preliminary
prospectus) included in such Shelf Registration Statement and any amendment or
supplement thereto as such Holder may reasonably request; and the Company
consents to the use of such prospectus or any amendment or supplement thereto by
each of the selling Holders of Transfer Restricted Securities in connection with
the offer and sale of the Transfer Restricted Securities covered by such
prospectus or any amendment or supplement thereto.

          (f)  The Company and the Guarantors will furnish to each Initial
Purchaser and each Exchanging Dealer, and to any other Holder who so requests,
without charge, at least one conformed copy of the Exchange Offer Registration
Statement and any post-effective amendment thereto, including financial
statements and schedules and, if any Initial Purchaser or Exchanging Dealer or
any such Holder so requests in writing, all exhibits thereto (including those,
if any, incorporated by reference).

          (g)  The Company and the Guarantors will, during the Exchange Offer
Registration Period or the Shelf Registration Period, as applicable, promptly
deliver to each Initial Purchaser, each Exchanging Dealer and such other persons
that are required to deliver a prospectus following the Registered Exchange
Offer, without charge, as many copies of the final prospectus included in the
Exchange Offer Registration Statement or the Shelf Registration Statement and
any amendment or supplement thereto as such Initial Purchaser, Exchanging Dealer
or other persons may reasonably request; and the Company and each Guarantor
consents to the use of such prospectus or any amendment or supplement thereto by
any such Initial Purchaser, Exchanging Dealer or other persons, as applicable,
as aforesaid.

          (h)  Prior to the effective date of any Registration Statement, the
Company and the Guarantors will use their reasonable best efforts to register or
qualify, or cooperate with the Holders of Securities, Exchange Securities or
Private Exchange Securities included therein and their respective counsel in
connection with the registration or qualification of, such Securities, Exchange
Securities or Private Exchange Securities for offer and sale under the
securities or blue sky laws 

 
                                                                               9

of such United States jurisdictions as any such Holder reasonably requests in
writing and do any and all other acts or things necessary or advisable to enable
the offer and sale in such jurisdictions of the Securities, Exchange Securities
or Private Exchange Securities covered by such Registration Statement; provided
                                                                       --------
that the Company and each Guarantor will not be required to qualify generally to
do business in any jurisdiction where it is not then so qualified or to take any
action which would subject it to general service of process or to taxation in
any such jurisdiction where it is not then so subject.

          (i)  The Company and the Guarantors will cooperate with the Holders
of Securities, Exchange Securities or Private Exchange Securities to facilitate
the timely preparation and delivery of certificates representing Securities,
Exchange Securities or Private Exchange Securities to be sold pursuant to any
Registration Statement free of any restrictive legends and in such denominations
and registered in such names as the Holders thereof may request in writing prior
to sales of Securities, Exchange Securities or Private Exchange Securities
pursuant to such Registration Statement.

          (j)  If any event contemplated by Section 4(b)(ii) through (v) occurs
during the period for which the Company and the Guarantors are required to
maintain an effective Registration Statement, the Company and the Guarantors
will promptly prepare and file with the Commission a post-effective amendment to
the Registration Statement or a supplement to the related prospectus or file any
other required document so that, as thereafter delivered to purchasers of the
Securities, Exchange Securities or Private Exchange Securities from a Holder,
the prospectus will not include an untrue statement of a material fact or omit
to state a material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made, not misleading.
Notwithstanding anything to the contrary contained in this Agreement, the
Company may issue a notice (a "Suspension Notice") to the Holders stating that a
Shelf Registration Statement may not be used; a Suspension Notice may be given
by the Company pending the announcement of material information by the Company
which the Board of Directors of the Company has determined, based upon an
opinion of counsel, would be required to be disclosed in such Registration
Statement in order to make the statements therein not misleading, and may issue
any Suspension Notice suspending use of the Shelf Registration Statement
required under applicable securities laws to be issued (a "Suspension").  In the
event that the aggregate number of days in any consecutive twelve-month period
for which all such Suspension Notices are issued and effective exceeds 45 days
in the aggregate, then the Company will be obligated to pay liquidated damages
to each Holder of Transfer Restricted Securities, during the period of one or
more such Suspension, in an amount equal to $0.192 per week per $1,000 principal
amount of Transfer Restricted Securities held by such Holder.

          (k)  Not later than the effective date of the applicable Registration
Statement, the Company and the Guarantors will provide a CUSIP number for the
Securities, the Exchange Securities and the Private Exchange Securities, as the
case may be, and provide the applicable trustee with printed certificates for
the Securities, the Exchange Securities or the Private Exchange Securities, as
the case may be, in a form eligible for deposit with The Depository Trust
Company.

 
                                                                              10

          (l)  The Company and the Guarantors will comply with all applicable
rules and regulations of the Commission and will make generally available to its
security holders as soon as practicable after the effective date of the
applicable Registration Statement an earning statement satisfying the provisions
of Section 11(a) of the Securities Act; provided that in no event shall such
                                        --------                            
earning statement be delivered later than 45 days after the end of a 12-month
period (or 90 days, if such period is a fiscal year) beginning with the first
month of the Company's first fiscal quarter commencing after the effective date
of the applicable Registration Statement, which statement shall cover such 12-
month period.

          (m)  The Company and the Guarantors will cause the Indenture or the
Exchange Securities Indenture, as the case may be, to be qualified under the
Trust Indenture Act as required by applicable law in a timely manner.

          (n)  The Company and the Guarantors may require each Holder of
Transfer Restricted Securities to be registered pursuant to any Shelf
Registration Statement to furnish to the Company and the Guarantors such
information concerning the Holder and the distribution of such Transfer
Restricted Securities as the Company and the Guarantors may from time to time
reasonably require for inclusion in such Shelf Registration Statement, and the
Company and the Guarantors may exclude from such registration the Transfer
Restricted Securities of any Holder that fails to furnish such information
within a reasonable time after receiving such request.

          (o)  In the case of a Shelf Registration Statement, each Holder of
Transfer Restricted Securities to be registered pursuant thereto agrees by
acquisition of such Transfer Restricted Securities that, upon receipt of any
notice from the Company pursuant to Section 4(b)(ii) through (v) or upon receipt
of a Suspension Notice, such Holder will discontinue disposition of such
Transfer Restricted Securities until such Holder's receipt of copies of the
supplemental or amended prospectus contemplated by Section 4(j) or until advised
in writing (the "Advice") by the Company and the Guarantors that the use of the
                 ------                                                        
applicable prospectus may be resumed.  If the Company and the Guarantors shall
give any notice under Section 4(b)(ii) through (v) or give any Suspension Notice
during the period that the Company is required to maintain an effective
Registration Statement (the "Effectiveness Period"), such Effectiveness Period
                             --------------------                             
shall be extended by the number of days during such period from and including
the date of the giving of such notice or Suspension Notice, as the case may be,
to and including the date when each seller of Transfer Restricted Securities
covered by such Registration Statement shall have received (x) the copies of the
supplemental or amended prospectus contemplated by Section 4(j) (if an amended
or supplemental prospectus is required) or (y) the Advice (if no amended or
supplemental prospectus is required).

          (p)  In the case of a Shelf Registration Statement, the Company and
the Guarantors shall enter into such customary agreements (including, if
requested, an underwriting agreement in customary form) and take all such other
action, if any, as Holders of a majority in aggregate principal amount of the
Securities, Exchange Securities and Private Exchange Securities being sold or
the managing underwriters (if any) shall reasonably request in order to
facilitate any disposition of Securities, Exchange Securities or Private
Exchange Securities pursuant to such Shelf Registration Statement.

 
                                                                              11

          (q)  In the case of a Shelf Registration Statement, the Company and
the Guarantors shall (i) make reasonably available for inspection by a
representative of, and Special Counsel (as defined below) acting for, Holders of
a majority in aggregate principal amount of the Securities, Exchange Securities
and Private Exchange Securities being sold and any underwriter participating in
any disposition of Securities, Exchange Securities or Private Exchange
Securities pursuant to such Shelf Registration Statement, all relevant financial
and other records, pertinent corporate documents and properties of the Company
and its subsidiaries and (ii) use its reasonable best efforts to have its
officers, directors, employees, accountants and counsel supply all relevant
information reasonably requested by such representative, Special Counsel or any
such underwriter (an "Inspector") in connection with such Shelf Registration
                      ---------
Statement.

          (r)  In the case of a Shelf Registration Statement, the Company and
the Guarantors shall, if requested by Holders of a majority in aggregate
principal amount of the Securities, Exchange Securities and Private Exchange
Securities being sold, their Special Counsel or the managing underwriters (if
any) in connection with such Shelf Registration Statement, use its reasonable
best efforts to cause (i) its counsel to deliver an opinion relating to the
Shelf Registration Statement and the Securities, Exchange Securities or Private
Exchange Securities, as applicable, in customary form, (ii) its officers to
execute and deliver all customary documents and certificates requested by
Holders of a majority in aggregate principal amount of the Securities, Exchange
Securities and Private Exchange Securities being sold, their Special Counsel or
the managing underwriters (if any) and (iii) its independent public accountants
to provide a comfort letter in customary form, subject to receipt of appropriate
documentation as contemplated, and only if permitted, by Statement of Auditing
Standards No. 72.

          5.   Registration Expenses.  The Company and the Guarantors will bear
               ---------------------                                           
all expenses incurred in connection with the performance of their obligations
under Sections 1, 2, 3 and 4 and the Company and the Guarantors will reimburse
the Initial Purchasers and the Holders for the reasonable fees and disbursements
of one firm of attorneys (in addition to any local counsel) chosen by the
Holders of a majority in aggregate principal amount of the Securities, the
Exchange Securities and the Private Exchange Securities to be sold pursuant to
each Registration Statement (the "Special Counsel") acting for the Initial
                                  ---------------                         
Purchasers or Holders in connection therewith.

          6.   Indemnification.  (a)  In the event of a Shelf Registration
               ---------------                                            
Statement or in connection with any prospectus delivery pursuant to an Exchange
Offer Registration Statement by an Initial Purchaser or Exchanging Dealer, as
applicable, the Company and the Guarantors shall indemnify and hold harmless
each Holder (including, without limitation, any such Initial Purchaser or
Exchanging Dealer), its affiliates, their respective officers, directors,
employees, representatives and agents, and each person, if any, who controls
such Holder within the meaning of the Securities Act or the Exchange Act
(collectively referred to for purposes of this Section 6 and Section 7 as a
Holder) from and against any loss, claim, damage or liability, joint or several,
or any action in respect thereof (including, without limitation, any loss,
claim, damage, liability or action relating to purchases and sales of
Securities, Exchange Securities or Private Exchange Securities), to which that
Holder may become subject, whether commenced or threatened, under the Securities
Act, the Exchange Act, any other federal or state statutory law or 

 
                                                                              12

regulation, at common law or otherwise, insofar as such loss, claim, damage,
liability or action arises out of, or is based upon, (i) any untrue statement or
alleged untrue statement of a material fact contained in any such Registration
Statement or any prospectus forming part thereof or in any amendment or
supplement thereto or (ii) the omission or alleged omission to state therein a
material fact required to be stated therein or necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading, and shall reimburse each Holder promptly upon demand for
any legal or other expenses reasonably incurred by that Holder in connection
with investigating or defending or preparing to defend against or appearing as a
third party witness in connection with any such loss, claim, damage, liability
or action as such expenses are incurred; provided, however, that the Company and
                                         --------  -------
the Guarantors shall not be liable in any such case to the extent that any such
loss, claim, damage, liability or action arises out of, or is based upon, an
untrue statement or alleged untrue statement in or omission or alleged omission
from any of such documents in reliance upon and in conformity with any Holders'
Information; and provided, further, that with respect to any such untrue
                 --------  -------
statement in or omission from any related preliminary prospectus, the indemnity
agreement contained in this Section 6(a) shall not inure to the benefit of any
Holder from whom the person asserting any such loss, claim, damage, liability or
action received Securities, Exchange Securities or Private Exchange Securities
to the extent that such loss, claim, damage, liability or action of or with
respect to such Holder results from the fact that both (A) a copy of the final
prospectus was not sent or given to such person at or prior to the written
confirmation of the sale of such Securities, Exchange Securities or Private
Exchange Securities to such person and (B) the untrue statement in or omission
from the related preliminary prospectus was corrected in the final prospectus
unless, in either case, such failure to deliver the final prospectus was a
result of non-compliance by the Company or a Guarantor with Section 4(d), 4(e),
4(f) or 4(g).

          (b)  In the event of a Shelf Registration Statement, each Holder shall
indemnify and hold harmless the Company, its affiliates (including the
Guarantors), their respective officers, directors, employees, representatives
and agents, and each person, if any, who controls the Company within the meaning
of the Securities Act or the Exchange Act (collectively referred to for purposes
of this Section 6(b) and Section 7 as the Company), from and against any loss,
claim, damage or liability, joint or several, or any action in respect thereof,
to which the Company or a Guarantor may become subject, whether commenced or
threatened, under the Securities Act, the Exchange Act, any other federal or
state statutory law or regulation, at common law or otherwise, insofar as such
loss, claim, damage, liability or action arises out of, or is based upon, (i)
any untrue statement or alleged untrue statement of a material fact contained in
any such Registration Statement or any prospectus forming part thereof or in any
amendment or supplement thereto or (ii) the omission or alleged omission to
state therein a material fact required to be stated therein or necessary in
order to make the statements therein, in the light of the circumstances under
which they were made, not misleading, but in each case only to the extent that
the untrue statement or alleged untrue statement or omission or alleged omission
was made in reliance upon and in conformity with any Holders' Information
furnished to the Company and the Guarantors by such Holder, and shall reimburse
the Company and the Guarantors for any legal or other expenses reasonably
incurred by the Company and the Guarantors in connection with investigating or
defending or preparing to defend against or appearing as a third party witness
in connection with any such loss, claim, damage, liability or 

 
                                                                              13

action as such expenses are incurred; provided, however, that no such Holder
                                      --------  -------
shall be liable for any indemnity claims hereunder in excess of the amount of
net proceeds received by such Holder from the sale of Securities, Exchange
Securities or Private Exchange Securities pursuant to such Shelf Registration
Statement.

          (c)  Promptly after receipt by an indemnified party under this Section
6 of notice of any claim or the commencement of any action, the indemnified
party shall, if a claim in respect thereof is to be made against the
indemnifying party pursuant to Section 6(a) or 6(b), notify the indemnifying
party in writing of the claim or the commencement of that action; provided,
                                                                  -------- 
however, that the failure to notify the indemnifying party shall not relieve it
- -------                                                                        
from any liability which it may have under this Section 6 except to the extent
that it has been materially prejudiced (through the forfeiture of substantive
rights or defenses) by such failure; and provided, further, that the failure to
                                         --------  -------                     
notify the indemnifying party shall not relieve it from any liability which it
may have to an indemnified party otherwise than under this Section 6.  If any
such claim or action shall be brought against an indemnified party, and it shall
notify the indemnifying party thereof, the indemnifying party shall be entitled
to participate therein and, to the extent that it wishes, jointly with any other
similarly notified indemnifying party, to assume the defense thereof with
counsel reasonably satisfactory to the indemnified party.  After notice from the
indemnifying party to the indemnified party of its election to assume the
defense of such claim or action, the indemnifying party shall not be liable to
the indemnified party under this Section 6 for any legal or other expenses
subsequently incurred by the indemnified party in connection with the defense
thereof other than the reasonable costs of investigation; provided, however,
                                                          --------  ------- 
that an indemnified party shall have the right to employ its own counsel in any
such action, but the fees, expenses and other charges of such counsel for the
indemnified party will be at the expense of such indemnified party unless (1)
the employment of counsel by the indemnified party has been authorized in
writing by the indemnifying party, (2) the indemnified party has reasonably
concluded (based upon advice of counsel to the indemnified party) that there may
be legal defenses available to it or other indemnified parties that are
different from or in addition to those available to the indemnifying party, (3)
a conflict or potential conflict exists (based upon advice of counsel to the
indemnified party) between the indemnified party and the indemnifying party (in
which case the indemnifying party will not have the right to direct the defense
of such action on behalf of the indemnified party) or (4) the indemnifying party
has not in fact employed counsel reasonably satisfactory to the indemnified
party to assume the defense of such action within a reasonable time after
receiving notice of the commencement of the action, in each of which cases the
reasonable fees, disbursements and other charges of counsel will be at the
expense of the indemnifying party or parties.  It is understood that the
indemnifying party or parties shall not, in connection with any proceeding or
related proceedings in the same jurisdiction, be liable for the reasonable fees,
disbursements and other charges of more than one separate firm of attorneys (in
addition to any local counsel) at any one time for all such indemnified party or
parties.  Each indemnified party, as a condition of the indemnity agreements
contained in Sections 6(a) and 6(b), shall use all reasonable efforts to
cooperate with the indemnifying party in the defense of any such action or
claim.  No indemnifying party shall be liable for any settlement of any such
action effected without its written consent (which consent shall not be
unreasonably withheld), but if settled with its written consent or if there be a
final judgment for the plaintiff in any such action, the indemnifying party
agrees to indemnify and hold harmless any 

 
                                                                              14

indemnified party from and against any loss or liability by reason of such
settlement or judgment. No indemnifying party shall, without the prior written
consent of the indemnified party (which consent shall not be unreasonably
withheld), effect any settlement of any pending or threatened proceeding in
respect of which any indemnified party is or could have been a party and
indemnity could have been sought hereunder by such indemnified party, unless
such settlement includes an unconditional release of such indemnified party from
all liability on claims that are the subject matter of such proceeding.

     7. Contribution.  If the indemnification provided for in Section 6 is
        ------------                                                      
unavailable or insufficient to hold harmless an indemnified party under Section
6(a) or 6(b), then each indemnifying party shall, in lieu of indemnifying such
indemnified party, contribute to the amount paid or payable by such indemnified
party as a result of such loss, claim, damage or liability, or action in respect
thereof, (i) in such proportion as shall be appropriate to reflect the relative
benefits received by the Company and the Guarantors from the offering and sale
of the Securities, on the one hand, and a Holder with respect to the sale by
such Holder of Securities, Exchange Securities or Private Exchange Securities,
on the other, or (ii) if the allocation provided by clause (i) above is not
permitted by applicable law, in such proportion as is appropriate to reflect not
only the relative benefits referred to in clause (i) above but also the relative
fault of the Company and the Guarantors on the one hand and such Holder on the
other with respect to the statements or omissions that resulted in such loss,
claim, damage or liability, or action in respect thereof, as well as any other
relevant equitable considerations.  The relative benefits received by the
Company and the Guarantors on the one hand and a Holder on the other with
respect to such offering and such sale shall be deemed to be in the same
proportion as the total net proceeds from the offering of the Securities (before
deducting expenses) received by or on behalf of the Company and the Guarantors
as set forth in the table on the cover of the Offering Memorandum, on the one
hand, bear to the total proceeds received by such Holder with respect to its
sale of Securities, Exchange Securities or Private Exchange Securities, on the
other.  The relative fault shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to the Company or
a Guarantor or information supplied by the Company or a Guarantor on the one
hand, or to any Holders' Information supplied by such Holder on the other, the
intent of the parties and their relative knowledge, access to information and
opportunity to correct or prevent such untrue statement or omission.  The
parties hereto agree that it would not be just and equitable if contributions
pursuant to this Section 7 were to be determined by pro rata allocation or by
any other method of allocation that does not take into account the equitable
considerations referred to herein.  The amount paid or payable by an indemnified
party as a result of the loss, claim, damage or liability, or action in respect
thereof, referred to above in this Section 7 shall be deemed to include, for
purposes of this Section 7, any legal or other expenses reasonably incurred by
such indemnified party in connection with investigating or defending or
preparing to defend any such action or claim.  Notwithstanding the provisions of
this Section 7, an indemnifying party that is a Holder of Securities, Exchange
Securities or Private Exchange Securities shall not be required to contribute
any amount in excess of the amount by which the total price at which the
Securities, Exchange Securities or Private Exchange Securities sold by such
indemnifying party to any purchaser exceeds the amount of any damages which such
indemnifying party has otherwise paid or become liable to pay by reason of any
untrue or alleged untrue statement or 

 
                                                                              15

omission or alleged omission. No person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.

     8. Rules 144 and 144A.  The Company shall use its reasonable best efforts
        ------------------                                                      
to file the reports required to be filed by it under the Securities Act and the
Exchange Act in a timely manner and, if at any time the Company is not required
to file such reports, it will, upon the written request of any Holder of
Transfer Restricted Securities, make publicly available other information so
long as necessary to permit sales of such Holder's securities pursuant to Rules
144 and 144A.  The Company and each Guarantor covenants that it will take such
further action as any Holder of Transfer Restricted Securities may reasonably
request, all to the extent required from time to time to enable such Holder to
sell Transfer Restricted Securities without registration under the Securities
Act within the limitation of the exemptions provided by Rules 144 and 144A
(including, without limitation, the requirements of Rule 144A(d)(4)).  Upon the
written request of any Holder of Transfer Restricted Securities, the Company and
the Guarantors shall deliver to such Holder a written statement as to whether
they have complied with such requirements. Notwithstanding the foregoing,
nothing in this Section 8 shall be deemed to require the Company or a Guarantor
to register any of its securities pursuant to the Exchange Act.

     9. Underwritten Registrations.  If any of the Transfer Restricted
        --------------------------                                    
Securities covered by any Shelf Registration Statement are to be sold in an
underwritten offering, the investment banker or investment bankers and manager
or managers that will administer the offering will be selected by the Holders of
a majority in aggregate principal amount of such Transfer Restricted Securities
included in such offering, subject to the consent of the Company and the
Guarantors (which shall not be unreasonably withheld or delayed), and such
Holders shall be responsible for all underwriting commissions and discounts in
connection therewith.

          No person may participate in any underwritten registration hereunder
unless such person (i) agrees to sell such person's Transfer Restricted
Securities on the basis reasonably provided in any underwriting arrangements
approved by the persons entitled hereunder to approve such arrangements and (ii)
completes and executes all questionnaires, powers of attorney, indemnities,
underwriting agreements and other documents reasonably required under the terms
of such underwriting arrangements.

     10. Miscellaneous.  (a)  Amendments and Waivers.  The provisions of this
         -------------        ----------------------                         
Agreement may not be amended, modified or supplemented, and waivers or consents
to departures from the provisions hereof may not be given, unless the Company
and the Guarantors have obtained the written consent of Holders of a majority in
aggregate principal amount of the Securities, the Exchange Securities and the
Private Exchange Securities, taken as a single class.  Notwithstanding the
foregoing, a waiver or consent to depart from the provisions hereof with respect
to a matter that relates exclusively to the rights of Holders whose Securities,
Exchange Securities or Private Exchange Securities are being sold pursuant to a
Registration Statement and that does not directly or indirectly affect the
rights of other Holders may be given by Holders of a majority in aggregate
principal amount of the 

 
                                                                              16

Securities, the Exchange Securities and the Private Exchange Securities being
sold by such Holders pursuant to such Registration Statement.

          (b)  Notices. All notices and other communications provided for or
               -------                                                      
permitted hereunder shall be made in writing by hand-delivery, first-class mail,
telecopier or air courier guaranteeing next-day delivery:

          (i)   if to a Holder, at the most current address given by such Holder
     to the Company in accordance with the provisions of this Section 10(b),
     which address initially is, with respect to each Holder, the address of
     such Holder maintained by the Registrar under the Indenture, with a copy in
     like manner to Chase Securities Inc. and Lehman Brothers Inc.;

          (ii)  if to an Initial Purchaser, initially at its address set forth
     in the Purchase Agreement; and

          (iii) if to the Company or a Guarantor, initially at the address of
     the Company set forth in the Purchase Agreement.

          All such notices and communications shall be deemed to have been duly
given:  when delivered by hand, if personally delivered; one business day after
being delivered to a next-day air courier; five business days after being
deposited in the mail; and when receipt is acknowledged by the recipient's
telecopier machine, if sent by telecopier.

          (c)  Successors And Assigns.  This Agreement shall be binding upon the
               ----------------------                                           
Company, the Guarantors and their respective successors and assigns.

          (d)  Counterparts.  This Agreement may be executed in any number of
               ------------                                                  
counterparts (which may be delivered in original form or by telecopier) and by
the parties hereto in separate counterparts, each of which when so executed
shall be deemed to be an original and all of which taken together shall
constitute one and the same agreement.

          (e)  Definition of Terms.  For purposes of this Agreement, (i) the 
               -------------------
term "business day" means any day on which the New York Stock Exchange, Inc. is
open for trading, (ii) the term "subsidiary" has the meaning set forth in Rule
405 under the Securities Act and (iii) except where otherwise expressly
provided, the term "affiliate" has the meaning set forth in Rule 405 under the
Securities Act.

          (f)  Headings.  The headings in this Agreement are for convenience of
               --------                                                        
reference only and shall not limit or otherwise affect the meaning hereof.

          (g)  Governing Law. This Agreement shall be governed by and construed
               -------------                                                   
in accordance with the laws of the State of New York.

          (h)  Remedies.  In the event of a breach by the Company, a Guarantor 
               --------
or by any Holder of any of their obligations under this Agreement, each Holder
or the Company and the Guarantors, as the case may be, in addition to being
entitled to exercise all rights granted by law, including recovery of damages
(other than the recovery of damages for a breach by the Company or a Guarantor
of its obligations under Sections 1 or 2 hereof for which liquidated damages
have been 

 
                                                                              17

paid pursuant to Section 3 hereof), will be entitled to specific performance of
its rights under this Agreement. The Company, the Guarantors and each Holder
agree that monetary damages would not be adequate compensation for any loss
incurred by reason of a breach by it of any of the provisions of this Agreement
and hereby further agree that, in the event of any action for specific
performance in respect of such breach, it shall waive the defense that a remedy
at law would be adequate.

          (i)  No Inconsistent Agreements.  The Company and each Guarantor
               --------------------------                                 
represents, warrants and agrees that (i) it has not entered into, shall not, on
or after the date of this Agreement, enter into any agreement that is
inconsistent with the rights granted to the Holders in this Agreement or
otherwise conflicts with the provisions hereof, (ii) it has not previously
entered into any agreement which remains in effect granting any registration
rights with respect to any of its debt securities to any person and (iii)
without limiting the generality of the foregoing, without the written consent of
the Holders of a majority in aggregate principal amount of the then outstanding
Transfer Restricted Securities, it shall not grant to any person the right to
request the Company or any Guarantor to register any debt securities of the
Company or any Guarantor (or any guarantees of such debt securities) under the
Securities Act unless the rights so granted are not in conflict or inconsistent
with the provisions of this Agreement.

          (j)  No Piggyback on Registrations.  The Company, the Guarantor and
               -----------------------------                                 
their respective security holders (other than the Holders of Transfer Restricted
Securities in such capacity) shall not have the right to include any securities
of the Company in any Shelf Registration or Registered Exchange Offer other than
Transfer Restricted Securities.

          (k)  Severability. The remedies provided herein are cumulative and not
               ------------                                                     
exclusive of any remedies provided by law.  If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction to be
invalid, illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their reasonable best efforts to find and employ an alternative
means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction.  It is hereby stipulated and
declared to be the intention of the parties that they would have executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

          (l)  No Foreign Registration.  Nothing in this Agreement shall be
               -----------------------                                     
construed to require the Company or any Guarantor to offer any Exchange
Securities in any non-U.S. jurisdiction where such offer would be unlawful or
require registration or qualification.  Securities are "freely transferable" for
purposes of this Agreement if they are freely transferable in the United States,
regardless of whether they may transfered within any foreign jurisdiction.

 
                                                                              18

          Please confirm that the foregoing correctly sets forth the agreement
among the Company, the Guarantors and the Initial Purchasers.

                                          Very truly yours,
       
                                          ADVANSTAR COMMUNICATIONS INC.
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name:  Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer

       
       
                                          AHI HOLDING CORP.
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name:  Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer

       
       
                                          ADVANSTAR HOLDINGS, INC.
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name:  Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer
       
       
       
                                          THE MEN'S GUILD IN CALIFORNIA, INC.
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name:  Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer
       
       
       
                                          ART EXPOSITIONS INTERNATIONAL INC.
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name:  Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer
              

 
                                                                              19

                                          EXPOCON MANAGEMENT ASSOCIATES, INC.
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name: Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer
       
       
       
                                          ON DEMAND MARKETING, INC.
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name: Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer
       
       
       
                                          TECHNOLOGY EVENTS COMPANY, LLC
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name: Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer
       
       
       
                                          MAGIC KIDS, INC.
       
       
                                           By /s/ Robert L. Krakoff
                                             ______________________________
                                            Name: Robert L. Krakoff
                                            Title: Chairman & Chief 
                                                   Executive Officer
 

Accepted:

CHASE SECURITIES INC.


By____________________________
    Authorized Signatory



LEHMAN BROTHERS INC.


By____________________________
    Authorized Signatory

 
                                                                         ANNEX A


          Each broker-dealer that receives Exchange Securities for its own
account pursuant to the Registered Exchange Offer must acknowledge that it will
deliver a prospectus in connection with any resale of such Exchange Securities.
The Letter of Transmittal states that by so acknowledging and by delivering a
prospectus, a broker-dealer will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.  This Prospectus, as it
may be amended or supplemented from time to time, may be used by a broker-dealer
in connection with resales of Exchange Securities received in exchange for
Securities where such Securities were acquired by such broker-dealer as a result
of market-making activities or other trading activities.  The Company has agreed
that, for a period of 180 days after the Expiration Date (as defined herein), it
will make this Prospectus available to any broker-dealer for use in connection
with any such resale.  See "Plan of Distribution."

                                      A-1

 
                                                                         ANNEX B



          Each broker-dealer that receives Exchange Securities for its own
account in exchange for Securities, where such Securities were acquired by such
broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Securities.  See "Plan of Distribution."

                                      B-1

 
                                                                         ANNEX C

                             PLAN OF DISTRIBUTION


          Each broker-dealer that receives Exchange Securities for its own
account pursuant to the Registered Exchange Offer must acknowledge that it will
deliver a prospectus in connection with any resale of such Exchange Securities.
This Prospectus, as it may be amended or supplemented from time to time, may be
used by a broker-dealer in connection with resales of Exchange Securities
received in exchange for Securities where such Securities were acquired as a
result of market-making activities or other trading activities.  The Company has
agreed that, for a period of 180 days after the Expiration Date, it will make
this prospectus, as amended or supplemented, available to any broker-dealer for
use in connection with any such resale.  In addition, until _______________,
199_, all dealers effecting transactions in the Exchange Securities may be
required to deliver a prospectus.

          The Company will not receive any proceeds from any sale of Exchange
Securities by broker-dealers.  Exchange Securities received by broker-dealers
for their own account pursuant to the Registered Exchange Offer may be sold from
time to time in one or more transactions in the over-the-counter market, in
negotiated transactions, through the writing of options on the Exchange
Securities or a combination of such methods of resale, at market prices
prevailing at the time of resale, at prices related to such prevailing market
prices or at negotiated prices.  Any such resale may be made directly to
purchasers or to or through brokers or dealers who may receive compensation in
the form of commissions or concessions from any such broker-dealer or the
purchasers of any such Exchange Securities.  Any broker-dealer that resells
Exchange Securities that were received by it for its own account pursuant to the
Registered Exchange Offer and any broker or dealer that participates in a
distribution of such Exchange Securities may be deemed to be an "underwriter"
within the meaning of the Securities Act and any profit on any such resale of
Exchange Securities and any commission or concessions received by any such
persons may be deemed to be underwriting compensation under the Securities Act.
The Letter of Transmittal states that, by acknowledging that it will deliver and
by delivering a prospectus, a broker-dealer will not be deemed to admit that it
is an "underwriter" within the meaning of the Securities Act.

          For a period of 180 days after the Expiration Date the Company will
promptly send additional copies of this Prospectus and any amendment or
supplement to this Prospectus to any broker-dealer that requests such documents
in the Letter of Transmittal.  The Company has agreed to pay all expenses
incident to the Registered Exchange Offer (including the expenses of one counsel
for the Holders of the Securities) other than commissions or concessions of any
broker-dealers and will indemnify the Holders of the Securities (including any
broker-dealers) against certain liabilities, including liabilities under the
Securities Act.

_______________

//   In addition, the legend required by Item 502(e) of Regulation S-K will
     appear on the back cover page of the Registered Exchange Offer prospectus.

                                      C-1

 
                                                                         ANNEX D



     o    CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10
ADDITIONAL COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR
SUPPLEMENTS THERETO.

          Name:
          Address:
 



If the undersigned is not a broker-dealer, the undersigned represents that it is
not engaged in, and does not intend to engage in, a distribution of Exchange
Securities.  If the undersigned is a broker-dealer that will receive Exchange
Securities for its own account in exchange for Securities that were acquired as
a result of market-making activities or other trading activities, it
acknowledges that it will deliver a prospectus in connection with any resale of
such Exchange Securities; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.

                                      D-1