In my country, 24th is the main day of the holiday. We don't usually eat much during the day (there is a tale that if you don't eat anything during the day, you will see a little golden pig in the evening - haven't tried it yet, but believe after the whole day of being hungry one could possibly see various animals
... goats or llamas are possible too, maybe
...
... golden...
), just a soup or something and then the dinner is the main dish of the whole holidays. We spend time with the family during the day, prepare everything for the evening and watch fairy tales. The dinner consists of a fish (traditional is carp, but more and more people are doing other fish) with potato salad, in some families there's a fish soup, too. Then the children go somewhere like upstairs to watch, if the Baby Jesus, who brings the gifts here, is coming. They look out of the window, look for the star and then a bell tinkles, so they run into the room where the tree is and wow! There are gifts under the tree, lights and everything. This is always a big moment in every family with kids, the expression in their eyes and faces when they first see the lightened tree with the gifts. Then the gifts are opened and it's time to play a bit with new toys or read a new book with a cup of cocoa and cookies...ahhhh. Looking forward to tomorrow coming.