The Theatre at Washington’s season opens with William Shakespeare’s “The Tempest,” with two performances: Saturday at 8 p.m., Sunday at 3 p.m. The production marks the 10th year that students from Cambridge University have brought a near-professional Shakespearean performance on tour from the U.K. as part of the Cambridge American Stage Tour (CAST). Tickets are $20, $10 ages 18 and younger. Call 540-675-1253 or email TheatreVA@aol.com.