Here is a list of various horror* movies related to holidays throughout the year. Although not EVERY holiday has a horror movie, you'd be surprised at how many of them do! I'm sure this list is far from complete (feel free to comment with ones I've missed), and every year brings new movies. I "celebrate" special occasions with horror, and now you can too!
*Note: I'm focused on horror mostly. Some will be more "horror-comedy". And I'm including some that aren't horror for Halloween (because Halloween is "horror adjacent" in my mind. lol).
Although I could pick any point in the year as a starting point, I'm going with the big one.....