I play GG and live in Fairfax :D
Truth be told, all of the dedicated GG players in the area have either retired or moved away, but I'm usually ready to throw down.
Locations for GG in NOVA:
CyberGround - I'm the only GG player there though. Bobby's World - An arcade (of sorts) in Arlington which has one of the only GGAC arcade cabinets on the East Coast. A few people will get on the sticks. For more info check SRK.
If you're looking for BB comp, it's pretty well dead, as none of the GG players like it, and those who do like it are mostly online warriors. I'm not a fan myself, but I play occasionally.
Btw, if you have Metro access, that will give you access to a couple more players who live in the DMV area, including Sesshyru, 4r5, and Ketchy Ketch (who needs to start posting here )