- The Will Geer Theatricum Botanicum: Take a picnic to Shakespeare’s “Cymbeline” on Sundays at 3:30 p.m. May 31 through Sept. 27 at the outdoor amphitheater in Topanga Canyon. The clever set-up for this romantic play? Posthumus bets his friend that his wife Imogen’s faithfulness can never be shaken. “Julius Caesar” opens June 6 and runs Saturdays and Sundays through Sept. 26.