Designate a small elf figurine, stuffed animal or ornament as a “magic Christmas elf” (or reindeer or whatever you have on hand). These are the rules: Starting sometime after everyone has gone to bed on December 1st, the magic elf moves to a different location each night. It must be in plain sight in a public room (not hidden inside something else, or out in the garage), and once it's found no one can play with it or it can't move the next night. This busy little elf will hop to a different spot each day until, on the morning of December 24, it is found on the Christmas tree. When the elf is on the tree, you know it's Christmas Eve!