If you live in the Vancouver area, and can go out this Tuesday night, I'd highly recommend going to the Rio Theatre on Broadway and Commercial. They have a monthly D&D-themed improv show, which is pretty darn funny.
Check it out ahead of time on their website (www.criticalhitshow.com/) and show up at 7PM. Costumes are always encouraged, especially since it's Halloween season. It's 19+, but you get to buy beer at the concession!