Classic Christmas songs are made for singalongs, which is exactly the plan for “Admiral Sings Christmas,” the annual tradition that’s happening twice today at Admiral Congregational Church. Music director Keith Terhune wanted to be sure you were officially invited to be part of it. He, jazz musician Overton Berry, and The Admiral Choir are featured, and Keith explains, “We’re doing two shows at 4 and 7 PM with a chocolate reception 1/2 hour before each show. It’s the most fun way to really get everyone in the holiday spirit, singing as many Christmas songs as we can pack into an hour.” No admission charge, though donations are accepted, and they’re collecting nonperishable food donations, too. Admiral Church is at California/Hill.