Quique Avilés's celebration of the Salvadoran presence in D.C., Los Treinta: Three Decades of A Salvadoran Immigrant in the Nation's Capital is a performance piece derived from a research project that teased out real-life stories, anecdotes and concerns of Salvadorans in the Washington region. Part of GALA Theatre's ArteAmérica Series, the play will be further developed by the DC Arts Center for a longer run in the fall. Friday, July 30, and Saturday, July 31, at 8 p.m. GALA Theatre at Tivoli Square, 3333 14th St. NW. Tickets are $10. Call 202-234-7174 or visit galatheatre.org.