GAF basically started out as an internet discussion group for people who cotton to the idea of combining their interest in Victorian-era military history with 'frontier action shooting' - such as those of us who adopt a military persona for our shooting within SASS and NCOWS ..... but has been developing into an active shooting organization in its own right. The annual Grand Muster has been held for several years now, and folks are beginning to put on other shoots (locally/regionally) following the GAF concept. Even the GAF Musters permit 'regular' frontier action shooters to participate - in 'Scout' class - with their usual firearms (i.e. pistol caliber lever-action rifle and one of their two regular revolvers .... no shotguns, normally, in keeping with the Victorian-era military theme.)
As for contacts, go to the "Rosters" section of the GAF website, where there are maps showing the Departmental breakdown - clicking on the appropriate Department on the map of the US will bring up a listing of the HQ and Divisional officers, and members in that Dept. As you'll see, California is in the Dept. of the Pacific and Arizona is in the Dept. of the Platte .....
Actually, if you start 'hanging out' in The Barracks here in Cas City, you'll soon begin to develop a better 'feel' for GAF - introduce yourself there, and somebody from your vicinity will undoubtedly respond ....