GUERNEVILLE, NOV. 19 Live music: Keyboardist Ruben Valtierra Latin Orchestra performs salsa and Latin jazz 6-10 p.m. Sunday at Main Street Bistro,16280 Main St. Free. Valtierra has musically accompanied Santana, Aretha Franklin, Chick Corea and Elton John and currently lives in Sonoma County. 707-869-0501. OCCIDENTAL, NOV. 19 Author reading: Author and journalist Barbara...