1) “Christmas in Rockefeller Center,” 8-10 p.m., NBC. Here’s a Christmas combination — spectacle (the Rockettes and the lighting of a giant tree) plus lots of music. That includes Kelly Clarkson (the host), plus Jennifer Hudson (shown here at a previous event), Dan + Shay, Megan Hilty, Raye, Coco Jones, Thalia, The Backstreet Boys, and Little Big Town.
2) “Jimmy Fallon’s Holiday Seasoning Spectacular,” 10 p.m., NBC. Comedy and music combine, as Fallon roams a magical building. Each apartment seems to have a celebrity.
3) “Abbott Elementary,” 8-9 p.m., ABC. Before starting a winter break, the show offers two seasonal episodes. At 8, it’s time for the school to try its first holiday show; at 8:30, Melissa obsesses on perfection for the family dinner. Both episodes also involve visitors: At 8, Jacob’s brother arrives early; at 8:30, Janine and Gregory have a surprise guest.
4) “Sullivan’s Crossing,” 8 p.m., CW. Barring a late change, this Canadian drama has its final episodes of the season today and next Wednesday. Sully faces one crisis –Lola’s rage over learning he was the driver who hit her, long ago – while another looms. Also, “Inside the NFL” follows at 9.
5) “The Summit” finale, 9:30 p.m., CBS. Only four people remain, in the effort to reach the top and share a fortune. The game, alas, throws in two more twists. That’s followed at 10:30 by a “Ghosts” rerun from April: When Sam and Jay are gone, the ghosts find secrets about each other.