Why do the Mr Men and Little Miss need to save Christmas? Have you met Mr Grumpy yet?! Everyone loves Christmas. Well, almost everyone... Mr Grumpy is the grumpiest person in the world. He is so grumpy that he doesn't even like Christmas! But this year, Little Miss Tiny has a plan to make Mr Grumpy change his ways and show him just wonderful Christmas really is. Mr Men and Little Miss Celebrations introduce children to all the exciting occasions that people celebrate including sports day, a visit from the tooth fairy, Halloween and Chinese New Year.