There is no lack of cool locations in SF Bay Area. It's difficult to compare C-Base with anything but a local version could be http://hackerdojo.com/ at Mountain View.

Another thing is whether to stay in the same location or move around, stay in the Valley or jump to San Francisco... Anyway, this can be discussed in/after the first meeting.

A first meetup in September is a reasonable objective. Please explain what would you like to find there, format, topics, demos...