Spooky DnD One-Shot Adventure - Spooky

Adventure one-shot ideas for horror or Halloween. Assumed to take course over the an evening or night. Probably with a full moon.

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The characters are working for the local ruler hunting a criminal.
It is at an ancient arena which is used to hold a herd of donkeys.
There are a gang of wererats enjoying intoxicating mushrooms. And a scout seeks to stop a portal opening at midnight.
At some point someone finds a clue.
As the adventure progresses it gets colder and there is a snow storm

The characters are travelers looking for a night's shelter, after their coach had an accident. One or more characters has an inquisitive mount.
It is at an isolated village which is disguised by a hallucinatory terrain.
There are a patrol of guards preparing a sacrifice. And an deranged doctor seeks a way to restore their lover without divine magic.
At some point someone finds a mysterious riddle.
As the adventure progresses a series of tolling bells signal the arrival of a titan

The characters are a group of inventors gathered for a special challenge. A character has a treasure map of the place, promising "a great reward".
It is at an isolated village which borders on the Shadowfell.
There are spiders-worshipping goblins preparing a sacrifice. And a creature here is possessed by a sentient berserker axe.
At some point they uncover a secret stockpile.
As the adventure progresses people start breaking into song

The characters are local villagers spending the night here on a dare. A character is undead.
It is at a traveling circus which is home to several sinister cat.
There are a family of werewolves creating a strange garden. And a bone naga is trying to gain entry to a sacred place guarded by wards.
At some point something starts following the group.
As the adventure progresses there are hints leading to a great betrayal

The characters are working for the local ruler hunting a criminal.
It is at a foreboding castle which gives nightmares to any who try to sleep there.
There are a family of criminals preparing a sacrifice. And a hag is looking for a soul to complete a ritual.
At some point someone is poisoned.
As the adventure progresses a great evil starts to escape its prison