These are some Christmas ideas from prior years.
Theme: Brunch food where the kids wear their Christmas pajamas. Reindeer party.
Games: Limbo using a pole wrapped in Christmas lights. Reindeer hokey pokey (put your antlers/hooves/red nose/fluffy tail/body in and out). Decorate the kids as Christmas trees: wrap in tinsel, hang non-breakable ornaments, & put a star on top!
Crafts: Color your own reindeer face. (another mom did those adorable t-shirts for all the kids!)