D&D One Shot

The characters are renowned dragon hunters who must empty out a pretty circus. One or more characters has an inquisitive pet.
It is at a dusty tavern which is disguised by a hallucinatory terrain.
There are a group of dwarves hunting a nothic. And a graveyard wants to deliver a rune-covered carpet to an unscrupulous druid.
At some point they discover an unexpected place to rest.
As the adventure progresses people start to gather for a funeral

The PCs are troubled hermits who must make a mithril breastplate. A character is celebrating a special anniversary. The mood might be... relaxed
There is an attractive apprentice who betrays them partway through. they are the drinking companion of a character.
The characters start at a disrupted wedding. Partway through there is a big fight scene. If things slow down there is a murder.
Afterwards there is a reward of fame and glory.

The PCs are fiendish kobolds who must investigate the history of a ceremonial wolf. The mood might be... tense
There is an infamous scout who works against them.
The characters start in tense negotiations. Partway through there is a feast. If things are going nowhere a deity sends a sign.
It finishes with the characters splitting up treasure. Possible sequel... same villain in a new base

The PCs are veteran abberation hunters who must destroy an artifact from the Dungeon Master's Guide. The mood might be... relaxed
There is a hedonistic cleric who sets them the quest.
The characters start outside some ruins. At some point they meet a rival group. If things slow down an ally turns up with useful information.
Afterwards there is the characters splitting up treasure. Possible sequel... a character's homeland is under threat

The PCs are powerful instructors at an academy who must investigate the history of a fey key. It might involve zombies.
There is a rich paladin who works against them.
The characters start with an explosion. Early on they encounter a magical trap. If things are going nowhere a villain turns up.
It finishes with a reward of a grand feast. Possible sequel... same villain in a new base