Penton Media, Inc. DEFA14A

Washington, D.C. 20549
Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934
Filed by the Registrant   þ
Filed by a Party other than the Registrant o
Check the appropriate box:
  Preliminary Proxy Statement
  Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
  Definitive Proxy Statement
  Definitive Additional Materials
  Soliciting Material Pursuant to §240.14a-12
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check the appropriate box):
þ   No fee required.
o   Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
    (1 )   Title of each class of securities to which transaction applies:
    (2 )   Aggregate number of securities to which transaction applies:
    (3 )   Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
    (4 )   Proposed maximum aggregate value of transaction:
    (5 )   Total fee paid:
o   Fee paid previously with preliminary materials.
o   Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
    (1 )   Amount Previously Paid:
    (2 )   Form, Schedule or Registration Statement No.:
    (3 )   Filing Party:
    (4 )   Date Filed:



Penton Media, Inc.
The Penton Media Building
1300 East Ninth Street
Cleveland, OH 44114-1503
January 10, 2007
Dear Stockholder:
     You recently received proxy materials for the special meeting of stockholders of Penton Media, Inc. to be held in The Penton Media Building, 1300 East Ninth Street, Cleveland, Ohio on Tuesday, January 23, 2007 at 10:00 a.m. local time. If you have not yet voted, please take a moment right now to ensure that your shares are represented at this very important meeting.
     At the special meeting, you will be asked to approve a proposal to adopt the Agreement and Plan of Merger dated as of November 1, 2006, among Prism Business Media Holdings Inc., Prism Acquisition Co. and Penton (the “merger agreement”). You will also be asked to approve a proposal to adjourn the special meeting if necessary or appropriate to solicit additional proxies. These proposals are described in the proxy materials you recently received. We encourage you to read those materials carefully.
     In order to ensure that you have an opportunity to vote your shares, we have enclosed an additional proxy card that will allow you to exercise your rights as a stockholder.
     Our board of directors unanimously has determined that the merger is in the best interests of the stockholders of Penton Media, Inc., and unanimously recommends that you vote “FOR” the proposal to adopt the merger agreement as well as the proposal to adjourn the meeting if necessary or appropriate. This determination and recommendation are based, among other things, upon the unanimous recommendation of the special committee of our board of directors consisting of directors who do not own any shares of our preferred stock and are not affiliated with management or any holders of our preferred stock.
     Please vote by telephone or by internet today pursuant to the instructions enclosed. Remember — every share and every vote counts! Alternatively, you may sign, date and mail your proxy card in the envelope provided. If you have any questions, or need additional copies of the proxy materials, please call MacKenzie Partners, Inc., toll-free at (800) 322-2885 or collect at (212) 929-5500.
     Thank you in advance for voting promptly.
  /s/ Royce Yudkoff    
  Royce Yudkoff
Chairman of the Board