Regional arts and entertainment events

Sunday Holiday tradition It just wouldn't be Christmas without the Pennsylvania Ballet's performance of The Nutcracker. The troupe performs the Balanchine version at noon and 4 p.m. today at the Academy of Music, Broad and Locust Streets, and performances continue at 7 p.m. Wednesday, noon Thursday, 2 and 7 p.m. Saturday, noon and 4 p.m. next Sunday, 2 and 7 p.m. Dec. 28, noon and 4 p.m. Dec. 30, and noon Dec. 31. Tickets are $24 to $129. Call 215-893-1999.