The holiday slasher genre is giving gory gifts all over this season, with the grindhouse-steeped “Thanksgiving” and “It’s a Wonderful Knife” turning the memory of a classic upside down. And the trend will continue over on streaming platform Shudder when “The Sacrifice Game” drops. Directed by Jenn Wexler and set over the Christmas holiday at a school for girls in 1971 — shades of the ’70s classic “Black Christmas” — it involves students (Madison Baines, Georgia Acken) staying at school for the break and dealing with a gang of strangers/killers at the door. How does queer Olympian Gus Kenworthy figure into this? Is he the house mother? A murderer? Well, that’s a spoiler, so you’ll have to catch this one Dec. 8 to find out, but this holiday is going to be blood-red.