Check out the Tamarind Flick'r, a blog which announces mostly one-night local art shows. I keep checking the site the day after their various activities, so haven't attended one yet.
From the August exhibition. Amilcar Cruz, guitarist.
The Tamarind Flick'r is based at El Tamarindo Restaurant on Georgia Ave, an "art gallery/restaurant/lounge/acoustic venue featuring local area artists, musicians, photographers, and poets."