Either, like Occult said, a Christmas card decoration contest, or there's this thing that the devs do for AL (ya sorry) that has this:
You must wear certain items OR twin someone IN FRONT OF an object of your choosing. This goes on for x number of days, and everyone who does each day properly is put into a drawing for the prize. When the Christmas event starts, there are certain things around Alterra that are Christmasy, and they can be used for the screenshots.
Example-
DAY 1: TAKE A PICTURE NEXT TO THIS *insert pic here, but zoomed in so they have to find it* WEARING THIS *name an item or two* TWINNING SOMEONE *if you decide there must be twins*
This could go on for 7 days, and everytime someone does a day correctly, you add their name once again into the drawing. If I'm not explaining this correctly I can try tomorrow a different way or you can look at some examples.
Good luck with the contests!
EDIT: Here's a link to an AL one, and obviously you don't have to take the exact idea, you can mix it up some, but this might help more than my explanation.
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