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 circle of spellcasters hunting for a magical robe. A character is possessed by a ghost.
It is at a warded tower which has many strange lights.
There are local nobles and merchants making trouble. And a mind flayer is seeking help to summon creatures from the Far Realm.
At some point someone finds a clue.
As the adventure progresses people start to gather for a wedding

The characters are scholars researching a local mystery. Two of the characters are friendly rivals.
It is at a hilltop watchtower which gives nightmares to any who try to sleep there.
There are skeletons celebrating as if they were alive. And a spy seeks to protect a corrupting weapon.
At some point there are muffled screams.
As the adventure progresses the characters receive a series of visions

The characters are travelers looking for a night's shelter, after their coach had an accident. One or more characters are infected with lycanthropy.
It is at an overgrown planar fortress which is haunted by minor spirits.
There are a mix of friendly undead celebrating as if they were alive. And an deranged doctor seeks a way to restore their lover without divine magic.
At some point it starts to snow.
As the adventure progresses there are hints leading to a great betrayal

The characters are players of a particular game gathering for a "special" competition.
It is at a hilltop watchtower which has a sinister pentagram that only appears on this night each year.
There are hooded slaad cultists enjoying intoxicating mushrooms. And a shadow dragon wants help entering from the Shadowfell.
At some point they receive a useful sending.
As the adventure progresses people start to break into a terrible chanting

The characters are fugitives looking for somewhere to hide for the night. One or more characters is currently cursed.
It is at a museum of curios which was the site of several murders.
There are a patrol of guards sheltering for the night. And the red demigod seeks to survive a night at a hilltop mansion.
At some point an old foe arrives.
As the adventure progresses people start to break into a terrible chanting