well... napa is a far drive from SoCal...
SF has no real GOOD place for AllTracs to drive... plus, i just hate dealing with SF traffic. san jose, mountain view, berkeley or even moraga have some decent roads...
plus, there is a really nice park near just north of highway 24, in orinda.
but, i will NOT organize it. the last time i did, my girlfriend (now wife) spent well over $100 on food and drink, and only 5 people showed up. some people even complained about the $5 entry fee to get into the STATE OWNED AND OPERATED PARK.
heh... i'll stop now.