Bay seniors know that Christmas does not come once a year. On the heels of the December 25 extravaganza comes the Russian Orthodox celebration. This January 5 at 7 pm attend St.John the Baptist Serbian Orthodox Church in San Francisco for a concert of Eastern European holiday music by Slavyenka, a highly regarded chorus. Tickets $15 for seniors. If you develop a taste for this intensely rich genre, be sure to see where local women’s chorus Kitka is thrilling audiences next.