Spooky DnD One-Shot Adventure

The characters are cousins meeting up for a reunion. One or more characters have cursed magic items.
It is at an isolated village which has a sinister pentagram that only appears on this night each year.
There are hooded slaad cultists initiating new members. And an artifact is searching for a suitable bearer to take it away.
At some point someone discovers a trail of blood.
As the adventure progresses there are hints leading to a great betrayal

The characters are members of the local law hunting a criminal. A character thinks there is a big conspiracy.
It is at an isolated village which is the prison for a fiend.
There are hooded snake cultists initiating new members. And an insane doctor seeks a way to restore their lover without divine magic.
At some point someone goes missing.
As the adventure progresses there is a series of murders

The characters are a group of ghost investigators with a covered wagon, investigating a mystery. Two of the characters have fallen in love.
It is at a cave complex which is home to many spiders.
There are a family of criminals holding a funeral. And an old priest seeks to avoid their death, foretold to be on this night.
At some point A former friend of a character arrives seeking revenge.
As the adventure progresses stars in the sky start to disappear

The characters are fugitives looking for somewhere to hide for the night. One or more characters has an inquisitive pet.
It is at a walled graveyard which is cursed by a deity.
There are a pack of welcoming ghouls preparing for a feast. And an old priest seeks to avoid their death, foretold to be on this night.
At some point there is a loud knocking on a door.
As the adventure progresses the time of a bloody ritual approaches

The characters are friends and family witnessing a wedding. A character is haunted by a harmless ghost.
It is at a noble's estate which has an secret sacrificial chamber.
There are goblins who worship spiders, preparing a sacrifice. And a vampire bound to the place is looking for a suitable partner.
At some point there is a change of location.
As the adventure progresses there are hints leading to a great betrayal