Never been to one of these, but it might be a nice way to kill a Thursday night. 6:30-8:30PM at the Santa Monica location, put on in tandem with AIARE (http://avtraining.org/).
http://www.rei.com/event/33365/session/41833 to RSVP. I went ahead and signed up; 12 spots left as of this post, but I'm sure you could probably just stand in the back and watch.