Any live performance by Philip Glass is an event, and although one can count on certain pieces being played (the Metamorphoses, the Etudes, Mad Rush), the preeminent modern minimalist often throws curveballs. Last year at Carnegie Hall, that meant unlikely guests Iggy Pop and Regina Spektor; this year in Napa, it means something called The Napa Trilogy, a medley of previous works. Glass’ charming wit is drier than the Sahara, but his playing is watery as ever; see him in the intimate hall on Thursday, April 28, at the Napa Valley Opera House. 1030 Main St., Napa. 8pm. $35–$45. 707.226.7372.