A group of rooms that is reserved by a party outside of the ECB but is present in the city as a result of the Main Event (for example, some exhibitors, some international tour groups). A Peripheral Blocks consumed room nights should be credited to the Main Events total room nights for historical tracking purposes. A Peripheral Block may be used to help offset attrition charges against the ECB A Peripheral Block usually negotiates its own terms (for example, 1/50, staff rate, etc. ). How do you identify Peripheral Blocks? Event organizers should require each contracted housing facility to report (to the event organizer) what groups are in-house at the same time as the Main Event. Each housing facility should include tour and travel, and wholesalers reservations which were booked individually over the dates of the Main Event.