The world-famous 18th Street Arts Center is home to a complex of contemporary artist studios, multiple exhibition spaces, and the acclaimed Highways Performance theatre; tonight they throw open their doors with a program of music, art, and performances from the political to the hilarious, powerful and beautiful. The ambitious group show Post-American LA examines the evolution of race and culture in this most international of cities; Art Fellow Sandra de la Loza hosts conversational happenings; and Conga drum legend Francisco Aguabella and writers from the New Playwrights Foundation take turns lighting up the courtyard.