I was told right off the bat not to choose any of the more obvious holidays. And I wouldn't have, anyway. What I ended up taking was VJ Day, a holiday no one even bothers to celebrate at all anymore, and barely even acknowledge. Once upon a time that day made a lot of folk pretty darned happy.
At any rate, here's the really cool cover for the book, featuring the Germanic version of a kind of evil Santa Claus we all know as Krampus.
And while you're waiting, buy my novels!