Before my mother passed away my siblings and I would all gather at our parents house on Christmas Eve. Our parents created a tradition of dressing up as a character after dinner to surprise the grandchildren and pass out presents. My mother created a poster with clues as to who the character would be and we had until after dinner to guess and enter our names in a pool. The winner received a gift.
They did this for at least 10 years, maybe 12. Some of the characters my father dressed as were Mrs. Claus, Baby New Year (with the diaper!), a western Santa and Rudolph. My father was ill one year so my husband was asked to participate. They rented an Easter Bunny costume for him to wear and it scared our youngest. Poor thing was crying while most others were in tears from laughing. We all have such fond memories of these times.