Headcanon: Narnia hadn’t had a Christmas in so long that many Christmas traditions were lost or forgotten. The Pevensies didn’t like that, so they introduced some of their own. They spent much of November of their first reign writing down and teaching the Narnian musicians carols and Christmas songs. They requested the cooks to make cakes and cookies. They required all the servants to take off from their duties to help decorate the enormous Christmas trees all over the castles. And by Christmas Eve, they closed everything up. They told the servants and cooks to go home, and they spent the night with just the four of them, singing, baking, eating–just like a normal Christmas. This became their tradition.