Skyline paintball has winter X-ball tournament series in Strasburg Va. which is probably an hour from D.C. They have a really nice turf field. www.skylinepaintball.com
There is also Pev's paintball the have their 3 man PTS series that you might able to play. Pev's is probably 45 min. from D.C. in Leesburg Va. I know that you mentioned playing D1 so you might be ranked to high to play in that one.