Alteration of society purposes requires governing-body proposal, prior member notice, and confirmation at two meetings with supermajority. Registered societies may alter, extend, abridge or amalgamate their purposes if the governing body submits a written or printed report, delivers or posts that report to every member prior to a special meeting, obtains a supermajority of member votes delivered in person or by proxy at that meeting, and secures confirming supermajority votes of members present at a second special meeting convened after the first.