The Signature Theatre Company presents productions in its permanent home, a state-of-the-art, Frank Gehry-designed multistage venue. Apr. 21-Jun. 7: the world premiere of The Painted Rocks at Revolver Creek, written and directed by Athol Fugard. Apr. 28-Jun. 7: What I Did Last Summer by A.R. Gurney. Schedules vary. $25-$45.