I get emails about this monthly happening, and grew up in Huntington Beach. The second Sunday of every month, there's a vintage bike meet there. Great classic bikes. If you're in Southern California, plan this as a KZrider Ride sometime, and you'll be back each month, like, for sure!!!
Here's the link:
www.vintagebikeoc.com/home/
If I lived in the area, I'd be there just to see the show, and, well, maybe the beach scene as well.