Hillstomp!!! I have heard this is the funnest time. I'm going. It's a FUN band at a great dancehall, the Olympia Ballroom! The music is fun. The dancing is single or group. None of that asking to dance crap necessary. There is a small cart that serves a limited alcohol and non alcohol menu. There is a full bar downstairs in the Urban Onion, but you can't transfer it back and forth. This meetup is also posted on 'Let's Play, Oly' - It's a fun night of dancing and music.
http://www.cdbaby.com/cd/hillstompsongs - Preview all songs option
Hillstomp with Kendall Winter and Summer Gold
$10 entrance - well worth it