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 a group of recently met adventurers sent to meet "someone". A character is haunted by a harmless ghost.
It is at a magical laboratory which is home to several sinister cat.
There are a variety of kobolds, sprites and other small-sized creatures, scavenging what they can. And a vengeful warlock seeks to burn everything to the ground.
At some point someone triggers an alarm.
As the adventure progresses people start breaking into song

The characters are gamblers gathering for a "special" competition.
It is at a royal stone arch which is built on the site of an ancient graveyard.
There are a coven of witches sheltering for the night. And the spirit of a necromancer is trying to escape from a crystal ball.
At some point one or more of the characters has a vision.
As the adventure progresses the characters receive a series of visions

The characters are the crew of a ship who have heard of a party happening here.
It is at a magical laboratory which is home to several sinister owls.
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 portal to another realm opens.
As the adventure progresses more and more things light on fire

The characters are a group of inventors gathered for a special exhibition. One or more characters is currently cursed.
It is at a foreboding castle which is built on the site of an ancient graveyard.
There are a group of monster hunters seeking a wraith. And an assassin wants to ransack a mysterious mage academy.
At some point someone has a vision.
As the adventure progresses people start breaking into song

The characters are a group of caravan guards protecting a single merchant, stopping here for the night. Two of the characters are former friends.
It is at a library of forbidden knowledge which has many strange lights.
There are angry locals seeking knowledge. And a shadow dragon wants help entering from the Shadowfell.
At some point a planar portal opens.
As the adventure progresses people start dying in different ways