Google Simi Valley Corvette Club.
They have a nice web site and are a pretty big club. I met some of their members at the Petersen Automotive Muesum, when the C7 was shown here a couple of weeks ago. Nice people.
Our club used to be the largest around, but people move away, or die. Vintage Corvettes of Southern California. Started in '71 We are in the San Fernando Valley, not far from Simi.
Our web site ' vintagecorvettessocal.com
Check out the events from both clubs, should be enough to get you going.