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
Contract Type FiledAugust 28th, 2000 Company
Exhibit 24.2 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
Contract Type FiledAugust 28th, 2000 CompanyThis agreement may be executed in separate counterparts by each of the undersigned, each of which shall be an original but all of which, taken together, shall constitute one and the same instrument. It shall not be necessary that each of the undersigned sign any one counterpart.
Exhibit 24.3 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 May 24 , 1999,...Joint Filing Agreement • May 24th, 1999 • Harris Irving B/Harris Neison/Harris William W Trust/ Et Al
Contract Type FiledMay 24th, 1999 CompanyThis agreement may be executed in separate counterparts by each of the undersigned, each of which shall be an original but all of which, taken together, shall constitute one and the same instrument. It shall not be necessary that each of the undersigned sign any one counterpart.