We begin, as we do every year, with this San Francisco tradition, famed for the entrance of the chorus bearing lighted candles into the darkened nave of Calvary Presbyterian Church. If you’re at all moved by early music, you won’t want to pass up the chance to hear the choir sing William Byrd’s motet O magnum mysterium along with a selection of Michael Praetorius Christmas carols. And, no worries, a few well-known carols as well.