San Francisco Bay Area youth ensembles will perform at 8 p.m., on the Elizabethan Stage at the Oregon Shakespeare Festival, 15 S. Pioneer St. Ashland. PACO features string players of high school age and younger — some who have performed together for as many as 10 years. This year, PACO will collaborate with 12 members of The Siskiyou Violins, a local ensemble of violin students directed by Faina Podolnaya. Tickets cost $14, $12 for seniors and $6 for students. Tickets and information are available at the OSF box office at 541-482-4331.