ST. NICHOLAS DAY O ANTIPHONS

Archbishop Salvatore J. Cordileone leads a St. Nicholas Day prayer service featuring the Benedict XVI Choir, 6 p.m. at St. Patrick Seminary and University, 320 Middlefield Road, Menlo Park. Focus on O Antiphons, ancient prayers sung at vespers during the last week of Advent. Free, but registration required. Eventbrite.com.