What are some traditions people do to celebrate Christmas?

Midnight Mass on Christmas Eve is the best known.

Roman Catholic AnswerThe Vigil of the Nativity was a major vigil in the old calendar, with the Martyrology sung with extra solemnity at Prime. It was a day of fast and abstinence. When I was younger, the neighbors from the Old Country, would have a big dinner on Christmas Eve with seven courses but no meat.