PENTON MEDIA, INC.





                      11 7/8% SENIOR SECURED NOTES DUE 2007







                          REGISTRATION RIGHTS AGREEMENT







                                                                  March 28, 2002





Credit Suisse First Boston Corporation

Eleven Madison Avenue

New York, New York 10010-3629





Ladies and Gentlemen:





         Penton Media, Inc., a Delaware corporation (the "ISSUER"), proposes to

issue and sell to Credit Suisse First Boston Corporation (the "INITIAL

PURCHASER"), upon the terms set forth in a purchase agreement, dated as of March

21, 2002 (the "PURCHASE AGREEMENT"), $157,500,000 aggregate principal amount of

its 11 7/8% Series A Senior Secured Notes due 2007 (the "INITIAL SECURITIES") to

be guaranteed by the guarantors party to the Indenture (as defined below) (the

"GUARANTORS" and, collectively with the Issuer, the "COMPANY"). The Initial

Securities will be issued pursuant to an indenture (the "INDENTURE"), dated as

of the Closing Date (as defined below), among the Issuer, the Guarantors and

U.S. Bank National Association, as trustee (the "TRUSTEE"). As an inducement to

the Initial Purchaser to enter into the Purchase Agreement, the Company agrees

with the Initial Purchaser, for the benefit of the Initial Purchaser and the

holders of the Securities (as defined below) (collectively the "HOLDERS"), as

follows:



         1. Registered Exchange Offer. Unless not permitted by applicable law

(after the Company has complied with the ultimate paragraph of this Section 1),

the Company shall prepare and, not later than 90 days (such 90th day being a

"FILING DEADLINE") after the date hereof (the "CLOSING DATE"), file with the

Securities and Exchange Commission (the "COMMISSION") a registration statement

(the "EXCHANGE OFFER REGISTRATION STATEMENT") on an appropriate form under the

Securities Act of 1933, as amended (the "SECURITIES ACT"), with respect to a

proposed offer (the "REGISTERED EXCHANGE OFFER") to the Holders of Transfer

Restricted Securities (as

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defined in Section 6 hereof), who are not prohibited by any law or policy of the

Commission from participating in the Registered Exchange Offer, to issue and

deliver to such Holders, in exchange for the Initial Securities, a like

aggregate principal amount of debt securities of the Company issued under the

Indenture, identical in all material respects to the Initial Securities and

registered under the Securities Act (the "EXCHANGE SECURITIES"). The Company

shall use its best efforts to (i) cause such Exchange Offer Registration

Statement to become effective under the Securities Act within 180 days after the

Closing Date (such 180th day being an "EFFECTIVENESS DEADLINE") and (ii) keep

the Exchange Offer Registration Statement effective for not less than 30 days

(or longer, if required by applicable law) after the date notice of the

Registered Exchange Offer is mailed to the Holders (such period being called the

"EXCHANGE OFFER REGISTRATION PERIOD").





         If the Company commences the Registered Exchange Offer, the Company (i)

will be entitled to consummate the Registered Exchange Offer 30 days after such

commencement (provided that the Company has accepted all the Initial Securities

theretofore validly tendered in accordance with the terms of the Registered

Exchange Offer) and (ii) will be required to consummate the Registered Exchange

Offer no later than 40 days after the date on which the Exchange Offer

Registration Statement is declared effective (such 40th day being the

"CONSUMMATION DEADLINE"); provided, however, that if the Company is required by

applicable law to keep the Exchange Offer Registration Statement effective for

more than 30 days in accordance with clause (ii) in the preceding paragraph, the

Consummation Deadline shall be automatically extended by such number of days

exceeding 30 for which the Company is required by applicable law to keep the

Exchange Offer Registration Statement effective.





         Following the declaration of the effectiveness of the Exchange Offer

Registration Statement, the Company shall promptly commence the Registered

Exchange Offer, it being the objective of such Registered Exchange Offer to

enable each Holder of Transfer Restricted Securities electing to exchange the

Initial Securities for Exchange Securities (assuming that such Holder (i) is not

an affiliate of the Company within the meaning of the Securities Act, (ii) is

acquiring the Exchange Securities in the ordinary course of such Holder's

business, (iii) has no arrangements or understanding with any person to

participate, and is not participating, in the distribution of the Exchange

Securities and (iv) is not prohibited by any law or policy of the Commission

from participating in the Registered Exchange Offer) to trade such Exchange

Securities from and after their receipt without any limitations or restrictions

under the Securities Act and without material restrictions under the securities

laws of the several states of the United States.





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      The Company acknowledges that, pursuant to current interpretations by the

Commission's staff of Section 5 of the Securities Act, in the absence of an

applicable exemption therefrom, (i) each Holder that is a broker-dealer electing

to exchange Initial Securities, acquired for its own account as a result of

market-making activities or other trading activities, for Exchange Securities

(an "EXCHANGING DEALER") is required to deliver a prospectus containing the

information substantially as set forth in (a) Annex A hereto on the cover, (b)

Annex B hereto in the "Exchange Offer Procedures" or similarly titled section

and the "Purpose of the Exchange Offer" or similarly titled section, and (c)

Annex C hereto in the "Plan of Distribution" section of such prospectus in

connection with a sale of any such Exchange Securities received by such

Exchanging Dealer pursuant to the Registered Exchange Offer and (ii) if the

Initial Purchaser elects to sell Exchange Securities or Private Exchange

Securities (as defined below) acquired in exchange for Initial Securities

constituting any portion of an unsold allotment, it is required to deliver a

prospectus containing the information required by Items 507 or 508 of Regulation

S-K under the Securities Act, as applicable, in connection with such sale.



      The Company shall use its best efforts to keep the Exchange Offer

Registration Statement effective and to amend and supplement the prospectus

forming a part thereof in order to permit such prospectus to be lawfully

delivered by all persons subject to the prospectus delivery requirements of the

Securities Act for such period of time as such persons must comply with such

requirements in order to resell the Exchange Securities; provided, however, that

(i) in the case where such prospectus and any amendment or supplement thereto

must be delivered by an Exchanging Dealer or the Initial Purchaser, such period

shall be the lesser of 180 days after the consummation of the Registered

Exchange Offer and the date on which all Exchanging Dealers and the Initial

Purchaser have sold all Exchange Securities held by them (unless such period is

extended pursuant to Section 3(j) below) and (ii) the Company shall make such

prospectus and any amendment or supplement thereto available to any

broker-dealer for use in connection with any resale of any Exchange Securities

for a period of not less than 180 days after the consummation of the Registered

Exchange Offer.



      If, upon consummation of the Registered Exchange Offer, the Initial

Purchaser holds Initial Securities acquired by it as part of its initial

distribution, the Company, simultaneously with the delivery of the Exchange

Securities pursuant to the Registered Exchange Offer, shall issue and deliver to

the Initial Purchaser, upon the written request of the Initial Purchaser, in

exchange (the "PRIVATE EXCHANGE") for the Initial Securities held by the Initial

Purchaser, a like principal amount of debt securities of the Company issued

under the Indenture and identical in all material





                                       3

{PAGE}

respects to the Initial Securities (the "PRIVATE EXCHANGE SECURITIES"). The

Initial Securities, the Exchange Securities and the Private Exchange Securities

are herein collectively called the "SECURITIES".



      In connection with the Registered Exchange Offer, the Company shall:



            (a) mail to each Holder a copy of the prospectus forming part of the

      Exchange Offer Registration Statement, together with an appropriate letter

      of transmittal and related documents;



            (b) keep the Registered Exchange Offer open for not less than 30

      days (or longer, if required by applicable law) after the date notice

      thereof is mailed to the Holders;



            (c) utilize the services of a depositary for the Registered Exchange

      Offer with an address in the Borough of Manhattan, The City of New York,

      which may be the Trustee or an affiliate of the Trustee;



            (d) permit Holders to withdraw tendered Initial Securities at any

      time prior to the close of business, New York time, on the last business

      day on which the Registered Exchange Offer shall remain open; and



            (e) otherwise comply with all applicable laws.



      As soon as practicable after the close of the Registered Exchange Offer or

the Private Exchange, as the case may be, the Company shall:



            (x) accept for exchange all the Initial Securities validly tendered

      and not withdrawn pursuant to the Registered Exchange Offer and the

      Private Exchange;



            (y) deliver to the Trustee for cancellation all the Initial

      Securities so accepted for exchange; and



            (z) cause the Trustee to authenticate and deliver promptly to each

      Holder of the Initial Securities, Exchange Securities or Private Exchange

      Securities, as the case may be, equal in principal amount to the Initial

      Securities of such Holder so accepted for exchange.





                                       4

{PAGE}

      Interest on each Exchange Security and Private Exchange Security issued

pursuant to the Registered Exchange Offer and in the Private Exchange will

accrue from the last interest payment date on which interest was paid on the

Initial Securities surrendered in exchange therefor or, if no interest has been

paid on the Initial Securities, from the date of original issue of the Initial

Securities.



      Each Holder participating in the Registered Exchange Offer shall be

required to represent to the Company that at the time of the consummation of the

Registered Exchange Offer (i) any Exchange Securities received by such Holder

will be acquired in the ordinary course of business, (ii) such Holder will have

no arrangements or understanding with any person to participate in the

distribution of the Initial Securities or the Exchange Securities within the

meaning of the Securities Act, (iii) such Holder is not an "affiliate," as

defined in Rule 405 under the Securities Act, of the Company or, if it is an

affiliate, such Holder will comply with the registration and prospectus delivery

requirements of the Securities Act to the extent applicable, (iv) if such Holder

is not a broker-dealer, that it is not engaged in, and does not intend to engage

in, the distribution of the Exchange Securities and (v) if such Holder is a

broker-dealer, that it will receive Exchange Securities for its own account in

exchange for Initial Securities that were acquired as a result of market-making

activities or other trading activities and that it will be required to

acknowledge that it will deliver a prospectus in connection with any resale of

such Exchange Securities.



      Notwithstanding any other provisions hereof, the Company will ensure that

(i) any Exchange Offer Registration Statement and any amendment thereto and any

prospectus forming part thereof and any supplement thereto complies in all

material respects with the applicable requirements of the Securities Act and the

rules and regulations of the Commission, (ii) any Exchange Offer Registration

Statement and any amendment thereto does not, when it becomes effective, contain

an untrue statement of a material fact or omit to state a material fact required

to be stated therein or necessary to make the statements therein not misleading

and (iii) any prospectus forming part of any Exchange Offer Registration

Statement, and any supplement to such prospectus, does not contain an untrue

statement of a material fact or omit to state a material fact required to be

stated therein or necessary in order to make the statements therein, in the

light of the circumstances under which they were made, not misleading.





      If following the date hereof there has been announced a change in

Commission policy with respect to exchange offers that in the reasonable opinion

of counsel to the Company raises a substantial question as to whether the

Registered Exchange Offer is permitted by applicable federal law, the Company

will use its best





                                       5

{PAGE}

efforts to seek a no-action letter or other favorable decision from the

Commission allowing the Company to consummate the Registered Exchange Offer. The

Company will pursue the issuance of such a decision to the Commission staff

level. In connection with the foregoing, the Company will take all such other

actions as may be reasonably requested by the Commission or otherwise required

in connection with the issuance of such decision, including without limitation

(i) participating in telephonic conferences with the Commission, (ii) delivering

to the Commission staff an analysis prepared by counsel to the Company setting

forth the legal bases, if any, upon which such counsel has concluded that the

Registered Exchange Offer should be permitted and (iii) diligently pursuing a

resolution (which need not be favorable) by the Commission staff.

Notwithstanding the foregoing, if at the time the Company is required to

commence or consummate the Registered Exchange Offer the Commission prohibits

exchange offers such as the Registered Exchange Offer, the Company will not be

obligated to seek such a no-action letter or other favorable decision from the

Commission.



      2. Shelf Registration. If, (i) because of any change in law or in

applicable interpretations thereof by the staff of the Commission, the Company

is not permitted to effect a Registered Exchange Offer, as contemplated by

Section 1 hereof, (ii) the Registered Exchange Offer is not consummated by the

180th day after the Closing Date, (iii) the Initial Purchaser so requests, in a

written notice delivered to the Company, with respect to the Initial Securities

(or the Private Exchange Securities) not eligible to be exchanged for Exchange

Securities in the Registered Exchange Offer and held by it following

consummation of the Registered Exchange Offer or (iv) any Holder (other than an

Exchanging Dealer) is not eligible to participate in the Registered Exchange

Offer or, in the case of any Holder (other than an Exchanging Dealer) that

participates in the Registered Exchange Offer, such Holder does not receive

freely tradeable Exchange Securities upon consummation of the Registered

Exchange Offer and any such Holder so requests, in a written notice delivered to

the Company, the Company shall take the following actions (the date on which any

of the conditions described in the foregoing clauses (i) through (iv) occur,

including in the case of clauses (iii) or (iv) the receipt of the required

notice, being a "TRIGGER DATE"):





            (a) The Company shall promptly (but in no event more than 45 days

      after the Trigger Date (such 45th day being a "FILING DEADLINE")) file

      with the Commission and thereafter use its best efforts to cause to be

      declared effective no later than 140 days after the Trigger Date (such

      140th day being an "EFFECTIVENESS DEADLINE") a registration statement (the

      "SHELF REGISTRATION STATEMENT" and, together with the Exchange Offer

      Registration





                                       6

{PAGE}

      Statement, a "REGISTRATION STATEMENT") on an appropriate form under the

      Securities Act relating to the offer and sale of the Transfer Restricted

      Securities by the Holders thereof from time to time in accordance with the

      methods of distribution set forth in the Shelf Registration Statement and

      Rule 415 under the Securities Act (hereinafter, the "SHELF REGISTRATION");

      provided, however, that no Holder (other than the Initial Purchaser) shall

      be entitled to have the Securities held by it covered by such Shelf

      Registration Statement unless such Holder agrees in writing to be bound by

      all the provisions of this Agreement applicable to such Holder.



            (b) The Company shall use its best efforts to keep the Shelf

      Registration Statement continuously effective in order to permit the

      prospectus forming a part thereof to be lawfully delivered by the Holders

      of the Transfer Restricted Securities, for a period of two years (or for

      such longer period if extended pursuant to Section 3(j) below) from the

      date of its effectiveness or such shorter period that will terminate when

      all the Transfer Restricted Securities covered by the Shelf Registration

      Statement (i) have been sold pursuant thereto or (ii) are no longer

      "restricted securities" (as defined in Rule 144 under the Securities Act,

      or any successor rule thereof). The Company shall be deemed not to have

      used its best efforts to keep the Shelf Registration Statement effective

      during the requisite period if it voluntarily takes any action that would

      result in Holders of Securities covered thereby not being able to offer

      and sell such Securities during that period, unless such action is

      required by applicable law or is expressly permitted by this Agreement.



            (c) Notwithstanding any other provisions of this Agreement to the

      contrary, the Company shall cause the Shelf Registration Statement and the

      related prospectus and any amendment or supplement thereto, as of the

      effective date of the Shelf Registration Statement, amendment or

      supplement, (i) to comply in all material respects with the applicable

      requirements of the Securities Act and the rules and regulations of the

      Commission and (ii) not to contain any untrue statement of a material fact

      or omit to state a material fact required to be stated therein or

      necessary in order to make the statements therein, in light of the

      circumstances under which they were made, not misleading.



      3. Registration Procedures. In connection with any Shelf Registration

contemplated by Section 2 hereof and, to the extent applicable, any Registered





                                       7

{PAGE}

Exchange Offer contemplated by Section 1 hereof, the following provisions

shall apply:



            (a) The Company shall (i) furnish to the Initial Purchaser, prior to

      the filing thereof with the Commission, a copy of the Registration

      Statement and each amendment thereof and each supplement, if any, to the

      prospectus included therein and, in the event that the Initial Purchaser

      (with respect to any portion of an unsold allotment from the original

      offering of Initial Securities) is participating in the Registered

      Exchange Offer or the Shelf Registration Statement, the Company shall use

      its best efforts to reflect in each such document, when so filed with the

      Commission, those comments as the Initial Purchaser reasonably may propose

      within a reasonable time after receiving any such document; (ii) include

      the information substantially as set forth in Annex A hereto on the cover,

      in Annex B hereto in the "Exchange Offer Procedures" or similarly titled

      section and the "Purpose of the Exchange Offer" or similarly titled

      section and in Annex C hereto in the "Plan of Distribution" section of the

      prospectus forming a part of the Exchange Offer Registration Statement and

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