I could organize one at my co-op space at USF. but its not all that convenient... far from BART etc. but its in the city.
or.. how about emeryville? I have a contact at Color Wheel and they are right at Doyle st park. He might be interested in organizing if we had like 4 or 5 solid people planning to come and set up. I got a ton of stuff id let go for a song just to get the wheels turning.