Very active UMD ballroom dance club, with classes in ballroom dance, swing, and lindy, weekly outings, and several big ballroom dances each semester.
Info on all styles of dancing in the metro area (swing, lindy, salsa, tango, ballroom, etc.)
A great place for relaxation, recreation, and events, including the area's biggest swing dances, not to mention cajun and zydeco dancing, contra dancing, waltzes, etc. See their weekly calendar of events.
Web page for the serious lindyhoppers in the D.C. area, with weekly events, etc.
Good info on nightclubs, dancing, music, theater, and metro area events in general. Used to be easier to find dancing in particular, but unfortunately the navigation is no longer as easy.