Great event, many British bikes but all are welcome! Upwards of 800 to 900 bikes show up and the day ends with a bike show.
The event is free and open to the public although you can purchase snacks, t shirts, etc. Best to get there early as many riders take their bikes on a mapped ride for fun at 10AM and a ride pin if you have a British bike.
The event is held at the Hansen Dam Recreation area near Sylmar CA. Here's a link to the event as posted on the Social Norton Owners website.
http://socalnorton.com/wp/calendar/