D&D One Shot

The PCs are wealthy orcs who must survive an undead apocalypse. Two of the characters have fallen in love. It might involve sahuagin.
There is a loud witch who betrays them partway through.
The characters start with an escaped monster. Early on they encounter a trapped chest. If things slow down a villain turns up.
It finishes with a reward of a tavern.

The PCs are fugitive sages who must destroy an overgrown shipwreck. A character is haunted by a harmless ghost. The mood might be... deep
There is a resourceful druid who comes with them.
The characters start in a chase scene. At some point there is a local festival. If things get stuck a deity sends a sign.
It finishes with a religious ritual.

The characters are successful military organisation who must deliver a priceless pet. One or more characters is currently is carrying a disease.
It is at a warded tree village which is a dead magic zone (similar to an antimagic field).
There are a family of thieves pacing up and down. And a successful wizard wants to destroy a sacred city rooftops.
At some point a talkative NPC provides useful information.
As the adventure progresses a series of grim omens signal the arrival of a deity of fire

The PCs are emotionally-scarred tieflings who must investigate the history of a holy breastplate. A character thinks another character is a shapechanger. It might involve bullywugs.
There is a friendly druid who comes with them. they are the aunt of a character.
The characters start at a burning tavern. Early on they encounter mold. If things slow down there is a explosion.
It finishes with the characters all posing together.

The PCs are all undead who must win a sporting event. One or more characters have cursed magic items. The mood might be... relaxed
There is a ruthless scout who betrays them partway through. they are part of same organisation as a character.
The characters start in a chase scene. At some point they meet an intelligent beast. If things slow down they receive a useful sending spell.
Afterwards there is a reward of a favorable marriage.