At the end of World 9, the Quest givers gave 3x3 box presents that had great items in them, from high q cutlery to metal and silk. This made questing not only lucrative, but addictive and exciting! Maybe uh... Maybe don't put gold and silk cloth in them this time unless you have really high charisma... I know I'm going to be popular for encouraging more questing

You can probably also use your imagination to think of other things to add to a Haven Christmas event; bonuses to eating, exp events like a Sprucecap Santa special event, other fun festive things like mistletoe becoming kissy mistletoe special curios.
Now you look forward to Winter, and you farewell it pleasantly when it goes and the farming begins anew

Edit: Noticed in the W12 Trailer that there were obvious Christmas lights on some of the trees. Suggestion may actually be implemented lol.