California's public meeting law is a model of clarity:
• City council members, county supervisors, school board trustees and other local elected and appointed officials can't act on any item that isn't on their meeting agenda.
• Barring an emergency, agendas must be posted at least three days in advance of the meeting.
• Executive sessions are, for the most part, limited to litigation and labor and real estate negotiations, and any decision made behind closed doors must be disclosed as soon as the public meeting reconvenes.