Spooky DnD One-Shot Adventure - Spooky

The characters are the crew of a ship who have heard of a party happening here. A character has a treasure map of the place, promising "a great reward".
It is at an underground tomb complex which has strong ties to the Feywild.
There are a group of scavengers choosing a leader. And a few creatures are inhabited by intellect devourers who seek new hosts.
At some point someone discovers a sacrificial chamber.
As the adventure progresses there are hints leading to a great betrayal

The characters are members of a crime family gathering for a meeting with the boss. Two of the characters have fallen in love.
It is at an abandoned palace which is the prison for an evil spirit.
There are bullywugs worshipping many-eyed creatures. And a vengeful warlock seeks to burn everything to the ground.
At some point a ghost gives them aid.
As the adventure progresses objects start to talk

The characters are a group of inventors gathered for a special exhibition.
It is at a library of forbidden knowledge which is built on the site of an ancient graveyard.
There are acolytes of a local temple attempting to contact a mysterious being. And a famous artist is trying to finish a masterpiece by morning.
At some point something goes missing.
As the adventure progresses a great evil starts to escape its prison

The characters are friends and family of an adventurer, gathered for a funeral. One or more characters has an inquisitive mount.
It is at an underground tomb complex which has a sinister pentagram that only appears on this night each year.
There are a group of grells trying to stay undiscovered. And a bone naga is trying to gain entry to a sacred place guarded by wards.
At some point something goes missing.
As the adventure progresses people start breaking into song

The characters are a group of creators gathered for a special exhibition. A character thinks there is a big conspiracy.
It is at an ancient arena which has strong ties to the Nine Hells.
There are a mismatched group of awakened animals choosing a leader. And an old priest seeks to avoid their death, foretold to be on this night.
At some point a drunk friend of a character arrives.
As the adventure progresses people start to break into a terrible chanting