Sounds like a great meet idea. The Marin County Civic Center is less than 30 minutes from me!

Another good place to meet in the Bay Area is Heather Farms in Walnut Creek. The NorCal members of the 4th generation Honda Accord owner's forum that I belong to almost always meet there because it's central to everyone. People come from as far away as Sac, Santa Cruz, Modesto, Stockon. There's TONS of free parking everywhere and it's close to some great backroads that I take all the time. There are also plenty of places to eat in the surrounding areas.