A Celtic Christmas Concert will be held Dec. 20 and 21 in the Cathedral. Both performances begin at 7:30 p.m. and tickets are on sale now. The concert sells out every year and tickets are only $25 each until Dec. 1, when the price will go up to $27. Tickets may only be purchased online at www.celticchristmasaustin.com. For more information, call (512) 472-4540 or e-mail email@example.com. No tickets will be available at Ave Maria Gift Shop.