. . "The Open Meetings Act by its very terms applies to all government agencies, which are defined to include, among other things, ???[e]very county, municipal corporation, school district, or other political subdivision of this state??? and ???[e]very city, county, regional, or other authority established pursuant to the laws of this state.??? O.C.G.A. ?? 50-14-1(a)(1)(B), (D) (emphasis added)." . .