My favourite activity in SL around Christmas is, hands down, Zombie Santa Claus. I’ve been killing zombie Claus for at least the last 3 years- first year we had little vials of holy water to throw at them, this year and last we start off with pillows to hit them with. You get tickets to redeem occasionally upon killing zombies, for a selection of fabulous prizes- including new weapons like this most fun sword. The prizes are a nice perk, but really, the zombie killing action is the true reason I go.
They also give you low lag reindeer and Santa avatars to wear while hunting- this is one of the secret prizes from last year, a blood spattered reindeer.
I went back later when there were fewer people around and risked both proper clothes AND shadows! The sweater, skirt, and mask, are prizes from the event (clothes from SOUP, mask from [ni.ju])
This dress from katat0nik, and _this_ mask (there are 2) from [ni.ju] are also prizes! Plus, I’m using one of the advent calendar poses from aDORKable Poses, she’s given away one free pose every day!