This is a great game to play for your Christmas lesson - it contains the trivia board in the shape of a Christmas tree, and 2 sets of 20 Christmas-related questions - for 2 teams of players. Answers included, too! :)
This trivia game was kindly provided by Scholastic (can be also downloaded from their website). You as the teacher will need to print and cut out the trivia game board (or draw one on the chalkboard or whiteboard), then split your class into two groups: RED team and GREEN team. Toss a coin to see which team should go first.
See the game worksheet for the detailed instructions.