363 Source Tips
Dress code didn't seem to matter, but most people came from work, so they were in work attire.
Just down the street (1300s) is ACKC, an excellent chocolate-centered cafe.
I found parking on 14th, but make sure you get there at least a half hour early just in case.
If you want a drink after the show, Cafe St. Ex is practically right next door to the theater.
Try Le Palasio, el salvadorean restaurant across the street, very good.
U Street area is only a couple of blocks away if you're looking for a post-theater meal.
You can buy snacks at intermission and that goes to support the theater
I would take the metro. There are not alot of parking on 14th street.