Hello Tim and welcome to the People's Republic of Californistan...
In CA there are two entites you might want to look into. One is the Traditional Archers of California (TAC) and the second is the Califoirnia Bowhunters and State Archery Association (CBH/SAA).
Californistan is a really big long state with world of difference between Northern and Southern CA. Personally I'd prefer Northern end of the state to the Southern, (where I presently live).
If you find yourself down in the southern end of the state look me up, otherwise perhaps we'll meet at the the Chamberlin Ranch Traditional 3-d shoot, usually held during April near Santa Barbara.
Anyway, welcome...