For a December even they should have it where you find/help/kill reindeer and cubs dressed as elves. There could also be a special lion dressed as Santa and when you meet him, if your karma is good, he will give you a gift.

For January you could come across lions with little party hats and have the occasional firework thing you could come across while exploring. You could also come across the zodiacs and get special event related items.

Just cute little ideas for a December and January event