This years show will be Saturday, October 5:
http://www.riponmenloparkpolicecarshow.com/
I'm really looking forward to this one because I plan to register 0327 for the show. It is always enjoyable to see and chat with other West Coast SSP and EV collectors. One of my favorite patrol cars, which I see there every year, is the black-and-white '57 Chevy.
They also have a collectables show. I usually end up hauling home something I don't really need; like the Tomar full light bar that came from an Oro Valley, AZ patrol car. I have no idea what I'm ever going to do with it but it looks good in my shop.