We celebrate Christmas Snake. You know, the day before Christmas Adam which, of course, is the day before Christmas Eve.
I admit I started this when I was a child. I noticed that we were always allowed to open a gift on Christmas Eve so the next year I asked if we could open one on Christmas Adam and to my surprise we were allowed so the next year I went for Christmas Snake and it just kinda stuck (though, the following year, Christmas Apple went over like a lead balloon). My brother has developed an annual party around "Christmas Snake". I'm willing to bet all my Christmas presents that my family is the only one that celebrates Christmas Snake.