Presenting its 4th annual Student/Teacher Dance Showcase, "Gotta Dance", directed by Julie Lowe, former principal dancer with Oakland Ballet, featuring a cast of 50 student and professional dancers performing classic ballroom, swing, Argentine Tango, etc. Aug. 13-14, 8pm, Cowell Theater, Fort Mason Center, Marina Blvd.(Buchanan St.), SF, 415-345-7575, www.metronomeballroom.com.