Spooky DnD One-Shot Adventure - Spooky

The characters are a circle of spellcasters hunting for mirror. One or more characters arrive late, bearing food.
It is at an isolated demiplane which is cursed by a deity.
There are a group of monster hunters holding a funeral. And the spirit of a necromancer is trying to escape from a crystal ball.
At some point it starts or stops snowing.
As the adventure progresses a great evil starts to escape its prison

The characters are members of a crime family gathering for a meeting with the boss.
It is at a derelict inn which has eyes that follow visitors everywhere.
There are plant creatures attempting to contact a mysterious being. And a mind flayer is seeking help to summon creatures from the Far Realm.
At some point there is a change of location.
As the adventure progresses more and more things light on fire

The characters are friends and family at the celebration.
It is at a museum of curios which is protected by a ghost.
There are kuo-toa worshipping many-eyed creatures. And a cult fanatic is seeking a way to pay a debt due tonight.
At some point someone triggers an alarm.
As the adventure progresses there is a series of murders

The characters are a group of monster hunters chasing a shapechanger. Two of the characters are friendly rivals.
It is at an ancient village which is the prison for an evil spirit.
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 someone rises from the dead.
As the adventure progresses people start dying in different ways

The characters are a group of inventors gathered for a special challenge. A character is a shapechanger.
It is at a foreboding castle which has a sinister pentagram that only appears on this night each year.
There are a mix of friendly undead celebrating as if they were alive. And a spymaster wants to escape from a beautiful monster graveyard.
At some point a spirit tries to communicate with a character.
As the adventure progresses more and more things light on fire