Something I forgot until I ran into it the other day is that the Columbia Heights Farmers Market on the Civic Plaza is now open on Wednesdays from 4 to 7:30pm. It's a great way to get some food to cook after work, or just a little snack. The vendors are basically the same as the main Saturday market, with maybe a couple fewer, and it's nice to wander around in any case.
The market is at the Columbia Heights Civic Plaza at the intersection of 14th, Park and Kenyon, and the Saturday market is open 9am-1pm.
They'll be open until December, if last year is any indication.