Reindeer food is a fun and festive activity for children to do before Christmas Eve. To make reindeer food, you'll need two cups of rolled oats and a quarter cup of glitter. Mix the oats and glitter together in a bowl until the glitter is evenly distributed. Then, scoop out one tablespoon of the mixture onto a piece of paper or plastic wrap. Repeat this process until you have enough reindeer food for each reindeer on Santa's sleigh. On Christmas Eve night, sprinkle the reindeer food outside in your yard or in the area where you're leaving carrots or apples for the reindeer.