Things to do in (and around) Washington, D.C. this weekend: September 11-13

Washington enters the weekend with the city in full cultural motion: stages are raising their curtains, neighborhoods are staying up late for art, and museums offer a strong case for spending an afternoon indoors. Whether the plan is a marquee performance, a ballgame or an unhurried gallery visit, Sept. 11-13 offers plenty of ways to make the most of the capital.