On Saturday, January 19th, Huzzah Hobbies will be holding its inaugural Dust Warfare tournament. Start time is 11 am, 300 point lists. There are no sign ups or attendance caps that I know of, and I'm sure the store would be glad to have to figure out where to put people if the turnout is greater than expected.
Tournament Jan 19 in Northern Virginia
Correction: the start time has been moved back to 10am instead of 11am.