Basically, anyone can make Christmas games trivia with the answers. But, most of the games are compiled by adults because they already have the knowledge of Christmas facts. They can be your parents, teachers, or your grandparents. They want to know how far do you understand the topic of Christmas trends, traditions, and such. Children and teens can also make the game with the answers. They are probably good at making the fun category. Just keep the answers secret so you can continue the game.
Many people agree that this game is best to be played after eating the feast. But, it is all as you like it. You can play this game while having a meal because the answers are based on Christmas food. You can also play this game before the feast to wait for all guests to arrive. Most people play this game after eating the food because they are already full, so they can think deeply about the answers. Also, some people use this game as the icebreaker. You can still play this game even when it is not Christmas day yet. For instance, you play this game when you are attending a language course.
It is actually debatable on revealing the truth about Santa to little children. Some parents stay lie to the children because they want to teach something that is included in Santa's rule on giving a good gift; being a kind kid. On the other hand, parents shouldn't lie about the existence of Santa because there is a behavioral development in children that they must support. There is a stage when they want to know the truth about everything, the real story about Santa. Parents are supposedly not skipping the developmental process of them.
Santa, as fictional as Tooth Fairy, are considered as mystical beings. As a result, many parents are afraid if someday their children might be disappointed by the truth. Parents can tell the whole reality about those fictional figures. But, there is another way to synchronize the fictional story with the reality around them. For instance, parents can let the kids tell the story about Santa Claus, where he lives, and what to do to get the present from him. From doing that, parents can show their affection by teaching them the motive of Santa, or other mystical characters they know.