Valentine's Day:
Guests proceed into a studio where a 1960's/1970's dating game show is being taped. A panicked Game Show Host pops out saying he didn't know that one of the contestants was crazy. Said contestant (our Dating Game Killer) holds out a human heart to the guests as the girl and two other male contestants are dead with their hearts cut out, some in heart shaped candy boxes. The Dating Game Killer jumps out at guests brandishing a knife as they exit.
See original music for this holiday by Sue Suhyun Kim here: https://soundcloud.com/suhyun-kim-932755037/holidays-of-horror-valentines-day-1
And read about the other holidays and their music at: https://www.myusemuse.com/holidaysofhorror