Immediately went to JGBP, which hasn't reported on the venue yet, as far as I can tell. The Google yielded an article in Pacific Sun on "Country Porn", with this little tidbit:
It all started at a little nightclub in the downtown called River City, where co-owner Ron Barbarita (Phil Lesh was also a partner) had worked diligently to establish his venue as the place to go for quality entertainment in Marin.
I'd really like to learn more about this, and in particular the nature and timeframe of Phil's involvement. Anyone got anything?