‘Twas the night before “Nickmas” and all through the house, every creature was stirring (except for the mouse).

Nickelodeon’s “Nickmas” will begin on Nov. 19 and last throughout the holiday season, bringing kids a total of more than 100 hours of seasonal programming. The event features 21 holly jolly premieres of its live-action, animation, preschool series. This includes a festive competition show, Top Elf, all-new episodes of hit-shows and reruns of fan faves, and an evening full of stars with the brand-new The All-Star Nickmas Spectacular.

Ever wonder how Santa chooses his elves? In a series of competitions, of course. In Top Elf, Santa invites seven talented “Elf-testants” to the North Pole to test their skills. They compete in a series of challenges — including a high-tech makeover for the jolly man and building a life-size countdown calendar — with the help of Santa’s elves. Each episode features a celebrity judge, such as JoJo Siwa or Jay Pharoah. The winner gets to claim the status of Top Elf and $25,000 donated to the charity of their choice. Episodes begin on Nov. 19 at 7:30 p.m. EST/PST and runs through Dec. 17.

On Nov. 28, kids can tune into the star-studded The All-Star Nickmas Spectacular at 9 p.m EST/PST. The hour-long variety show is hosted by Lex Lumpkin and features appearances by Gabriel Iglesias, Jay Pharoah, Tisha Campbell, Trevor Noah, and Young Dylan. JoJo Siwa, That Girl Lay Lay, and Ne-Yo bring in the tunes and casts of All That, The Astronauts, Danger Force, Group Chat, and Nickelodeon’s Unfiltered bring on the laughs with comedy sketches. Kids can also expect special appearances from some animated characters, including SpongeBob SquarePants, Lincoln and Lucy from The Loud House, and Ronnie Anne from The Casagrandes.

Scattered throughout the season, kids can catch all-new episodes of PAW Patrol, Santiago of the Seas, Blue’s Clues & You!, The Casagrandes, The Substitute, All That, Danger Force, and more. In addition, fan-favorite holiday episodes of Rugrats, SpongeBob SquarePants, and The Loud House will find their way home for the holidays.