Twelfth Night Singers, a south Oakland a cappella choral group, under the direction of Mimi Gass will perform secular and sacred works, including several celebrating the joy and cheer of the Christmas season. Tickets are not needed. A free-will offering will be taken.The group, now numbering 39 voices, was founded in 1980. In Renaissance costume, it performs Christmas music at clubs, churches, service agencies and institutions in southeastern Michigan. For more information, call (248) 544-4631 or view http://twelfthnightsingers.com.