Spooky DnD One-Shot Adventure - Spooky

The characters are a group of creators gathered for a special exhibition. A character is haunted by a harmless ghost.
It is at a grove of trees used to hang criminals which is cursed by a fairy godmother.
There are a pack of secretive ghouls enjoying intoxicating mushrooms. And a mind flayer is seeking help to summon creatures from the Far Realm.
At some point someone discovers a hidden coffin.
As the adventure progresses it gets colder and there is a snow storm

The characters are entertainers working at a special event. A character is accompanied by an annoying sibling.
It is at a ghost town which has a garden of huge vegetables.
There are kuo-toa worshipping many-eyed creatures. And there is a charismatic werewolf seeking to slay everyone by dawn.
At some point an npc betrays the characters.
As the adventure progresses there is a series of murders

The characters are local villagers spending the night here on a dare. Two of the characters are friendly rivals.
It is at a noble's estate which was the site of several murders.
There are a patrol of guards holding a funeral. And the spirit of a necromancer is trying to escape from a crystal ball.
At some point they uncover a secret stockpile.
As the adventure progresses people start to break into a terrible singing

The characters are a group of creators gathered for a special exhibition.
It is at an ancient ghost town which is visited by a storm each night.
There are kuo-toa worshipping many-eyed creatures. And an imp seeks suitable servants for its patron.
At some point it starts or stops raining.
As the adventure progresses it gets colder and there is a snow storm

The characters are a group of inventors gathered for a special challenge.
It is at a fortified asylum which gives nightmares to any who try to sleep there.
There are kuo-toa worshipping many-eyed creatures. And an old priest seeks to avoid their death, foretold to be on this night.
At some point a spirit tries to communicate with a character.
As the adventure progresses people start to break into a terrible singing