Exhibit 24.1 JOINT FILING AGREEMENT The undersigned hereby agree that the statement on Schedule 13D with respect to the shares of Common Stock, par value $.01 per share, of Penton Media, Inc., a Delaware corporation ("Penton"), dated October 2 , 2000,...Joint Filing Agreement • October 2nd, 2000 • Harris Irving B/Harris Neison/Harris William W Trust/ Et Al
POWER OF ATTORNEY The undersigned individuals hereby constitute and appoint King W. Harris, Jerome Kahn, Jr., Jack Polsky, Michael Resnick and Edward J. Schwartz and each of them individually, his true and lawful attorneys-in-fact and agents for him in his name, place and stead, to sign any and all initial filings on Schedule 13D under the Securities and Exchange Act of 1934, and any amendments thereto, relating to the securities of Penton and to file the same with the Securities and Exchange Commission and hereby grant to such attorneys-in-fact and agents, and each of them individually, full power and authority to do and perform each and every act and thing requisite and necessary to be done, as fully as to all intents and purposes as he might or could do, hereby ratifying and confirming all that such attorneys-in-fact and agents, or any of them, may lawfully do or cause to be done by virtue hereof in connection with such filings. This power of attorney shall expire on December 31, 20
