You'll be in line all day if you go there. IMO, Baked N Wired (on Thomas Jefferson, also in Georgetown) has much better cupcakes (and other baked goods), great coffee, and much shorter lines! These are not vegan, though. You'd need to go to Sticky Fingers in Columbia Heights/U St. for that.
I saw the other day that a Sprinkles is also moving in in Georgetown. DC is having cupcake overload!
I'm not sure what my weekends are like, but if you're gonna be hanging out in FB or Gtown, I'm sure my bike and I will be around--will try to stop by!
FYI, we always have a herd of people and bikes taking over Dean & Deluca on the weekends in Georgetown. But the coffee isn't so great, IMO. Only vegan things I can think of there might be their veggie sushi.

