Exhibit 24

                          DIRECTORS AND/OR OFFICERS OF
                               PENTON MEDIA, INC.

                           ANNUAL REPORT ON FORM 10-K

                                POWER OF ATTORNEY

KNOW ALL MEN BY THERE PRESENTS, that each of the undersigned directors and
officers of Penton Media, Inc., a Delaware corporation, hereby constitutes and
appoints David B. Nussbaum and Preston L. Vice, and each of them, as the true
and lawful attorney-in-fact or attorneys-in-fact, with full power of
substitution and revocation, for each of the undersigned and in the name, place
and stead of each of the undersigned, to sign on behalf of each of the
undersigned an Annual Report on Form 10-K for the fiscal year ended December 31,
2004 pursuant to Section 13 of the Securities and Exchange Act of 1934 and to
sign any and all amendments to such Annual Report, and to file the same, with
all exhibits thereto, and other documents in connection therewith, including,
without limitation, a Form 12b-25, with the Securities and Exchange Commission,
granting to said attorney-in-fact or attorneys-in-fact, and each of them, full
power and authority to do so and perform each and every act and thing requisite
and necessary to be done in and about the premises, as fully to all intents and
purposes as the undersigned might or could do in person, hereby ratifying and
confirming all that said attorney-in-fact or attorneys-in-fact or any of them or
their substitute or substitutes, may lawfully do or cause to be done by virtue
hereof.

This Power of Attorney may be executed in multiple counterparts, each of which
shall be deemed an original with respect to the person executing it.

Executed as of this 15th day of April 2005.

   /s/ DAVID B. NUSSBAUM                                  /s/ HANNAH C. CRAVEN
   ---------------------                                  ---------------------
   David B. Nussbaum                                      Hannah C. Craven
   Chief Executive Officer and Director                   Director
   (Principal Executive Officer)

   /s/ PRESTON L. VICE                                    /s/ PERRY A. SOOK
   -------------------                                    -----------------
   Preston L. Vice                                        Perry A. Sook
   Chief Financial Officer, Secretary                     Director
   (Principal Financial and Accounting Officer)

   /s/ ROYCE YUDKOFF
   -----------------
   Royce Yudkoff
   Chairman

   /s/ VINCENT D. KELLY
   --------------------
   Vincent D. Kelly
   Director

   /s/ PENI A. GARBER
   ------------------                                                  -
   Peni A. Garber
   Director

   /s/ R. DOUGLAS GREENE
   ---------------------
   R. Douglas Greene
   Director