The purpose of all A.A. group meetings, as the Preamble states, is for the A.A. member to "share their experience, strength and hope with each other that they may solve their common problem and help other to recover from alcoholism." Toward this end, A.A. groups have open and closed meetings.
Closed meeting are for A.A. members only, or for those who have a drinking problem and "have to desire to stop drinking".
Open Meetings are available to anyone interested in Alcoholics Anonymous' program of recovery from alcoholism. Non-alcoholics may attend open meeting as observers.
At both types of meetings, the A.A. chairperson may request that participants confine their discussion to matter pertaining to the recovery from alcoholism. It is the group conscience that determine the format of the meetings. (information from pamphlet. The A.A. Group)