Click 'List view' to see which holiday (or "special occasion day") each film represent.
They are organized by date (United States, 2012).
Now, these aren't necessarily my favorite horror films set on each holiday, but the ones that are the most obvious (as far as the actual titles go, anyway).
Some better holiday-set horror films:
Mardi Gras - Candyman: Farewell to the Flesh
St. Patrick's Day - Maniac Cop
Spring Break - Piranha 3D
Easter - Critters 2: The Main Course
Prom Night - Carrie
April Fool's Day - Slaughter High
Memorial Day - Memorial Valley Massacre
Fourth of July - Jaws
Thanksgiving - Blood Rage
Christmas - Black Christmas
New Year's Eve - Terror Train
Mark your calendar!