The annual Socal Norton Owners Club, "Best Ride by a Dam Site" is Sunday, November 6th. Lots of bikes, primarily vintage British bikes, but all are welcome - usually a smattering of LBC's too.
Admittance is free and there is a ride for those that want to enter their Brit bike in the judging later in the day. Very low key event but has a very large turnout, you can find details here: