The Metropolitan Museum of Art, 1000 Fifth Ave. at 82nd Street, continues a long-standing holiday tradition with the presentation of its annual Christmas tree and 18th-century Neapolitan Nativity scene, shown above. The 20-foot candlelit blue spruce will be on display in the Medieval Sculpture Hall through Tuesday, Jan. 6. Special tree-lighting ceremonies with recorded holiday music will take place on Fridays and Saturdays, at 4:30, 5:30 and 6:30 p.m., as well as on Tuesdays through Thursdays and Sundays, at 4:30 p.m. The museum is closed on Christmas and New Year’s Day. Viewings of the tree and nativity scene are free with admission to the museum. Call 212-535-7710.