Classical music events to attend during the holiday season California Bach Society Artistic Director Paul Flight leads the chorus in a program of five centuries’ worth of Italian Christmas music, including works by Monteverdi, Verdi and Respighi. Nov. 30-Dec. 2. $30. San Francisco, Palo Alto, Berkeley. 650-485-1097. www.calbach.org Ragazzi Boys Chorus The ensemble of young vocalists presents “For the Beauty …Continue readingFrom ‘Messiah’ onward, a cornucopia of holiday music around the bay