myrkassi:
A bit off-topic, perhaps, but this Challenge has got me wondering how the sub-genres in the Search page were chosen. For example, there's a Christmas sub-genre, but no Hallowe'en or Valentine's Day (and I know I've read more than one Hallowe'en-themed story...). Similarly, there's a sub-genre for school stories, but not office or hospital ones. Any ideas why?
Ah well, here's the thing... if someone has a spare six months (or even six years if you're a slow reader) to read through 28,816 (at the last count) stories on this site and identify those related to a Halloween theme, then we
might consider adding that category
if there is enough material to justify the setting up of a new category.
It's very kind of you to volunteer all your free time to do this for us, myrkassi. Welcome to the club!

And if I've interpreted that incorrectly, you can just browse the Supernatural category, where I'm sure you'll find many a Halloween tale...