As for barboxes, there are a number of places that have a table or two in DC proper up for challenges. They are usually in poor condition and the people you play will be very drunk. But it does make for a really fun night, especially when you try to stay on the table. My dad grew up in Baltimore and told me that he would go into the neighborhood bar on a Friday night and try to play all night on the same quarter, and a couple times he was able to do it. So when I started playing better than him, I figured that I could do it too. I've yet to last more than an hour or so.
Anyway, depending on where your hotel is, there are two spots where I've have a good time challenging folks on a barbox in DC. The first is Lucky Bar, in about the 1200 blk of Connecticut Avenue NW, Farragut North Metro Stop (Red Line). Fun place. The other is a sports bar at the Grand Hyatt. It's called Grand Slam and is at 10th and H Streets, NW, Gallery Place Metro Stop (Red/Green/Yellow Lines). They have a couple bar boxes in there. Keep in mind that in DC, we're not talking quarters a game, but dollars a game. So play well

A couple times at Gland Slam I wanted to keep playing but nobody would challenge the table because they had already put $15 in it, so I would offer to pay for a game to keep them playing. It's a weird hustle, since you don't make any money, but you keep getting played :smile:.
Ask Cory in DC about the bars in Capitol Hill. He used to play in a league over there and I believe they may have several places with one or two tables that might keep you occupied. Take care and have a great visit.