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 August 28 , 2000,...Joint Filing Agreement • August 28th, 2000 • Harris Irving B/Harris Neison/Harris William W Trust/ Et Al
