From the ISO Website:
Intergroups are made up of representatives from local groups. An intergroup may meet quarterly or monthly. The general purpose is to pool efforts. Some of the ways intergroups do this is by:
For an intergroup to be effective the meetings need to be held at a time and place that is fixed. Groups will support an intergroup if there is consistency.
An elected trusted servant of intergroup opens the meeting with the serenity prayer. Representatives introduce themselves and welcome new representatives and new groups. A treasurer's report is given and the Seventh Tradition follows. Usually time is allowed for announcements to be made concerning events or needs. Next old and new business items are discussed and reported on.