Outstanding article. Thanks for all the great followup opportunities; I assume that the links mean that the venue owners and management teams are open to the idea of polite inquiries.
There is another resource available; ConcertsInYourHome.com. Among other things, it has a huge international database of concert Hosts, resources for hosts and artists, annual festivals on each American coast, and other formats (like "Dinner and a Song", with a shorter format, and recognition for clubs that are true "Listening Rooms".
(Non-disclosure; I don't currently have any skin in that game, but I'm still a fan both of the site, and of Fran Snyder, the owner. I signed up for a year, but my Bar-gig-oriented website didn't seem to appeal to the House Concert crowd. Once my Speaking project replaces my "Dancing Monkey plays Sweet Home Margaritaville" income, I'll re-tool and sign up again.)
I appreciate the perspectives of other artists; loyalty to club owners and being "on" after the show. I've often wondered about that, and about the need to leave when the owners go to work.