D&D One Shot

The PCs are fun-loving farmers who must protect a corrupting chest. It might involve a cult.
There is a mysterious hireling who hates one of the characters. they are the childhood friend of a character.
The characters start with the loan or gift of a powerful magic item. At some point there is a chase scene. If things are going nowhere someone has/remembers a dream.
At the end there is a family gathering.

The PCs are religious farmers who must turn into a theme park a sparkling monster graveyard. A characters is under a geas. It might involve water.
There is a friendly paladin who wants to do the same thing. they are the uncle of a character.
The characters start on a sinking vessel. At some point they meet a rival group. If things get stuck a deity sends an omen.
At the end there is a newborn or child on the way. Possible sequel... one or more characters start having dreams related to an item from the adventure

The PCs are all members of the same crime family who must slay a honorable band of mercenaries. It might involve the Feywild.
There is a rival priest who works against them.
The characters start with the loan or gift of a powerful magic item. At some point they encounter a planar portal. If things slow down it starts to rain.
At the end there is a reward of a more dangerous quest with a great reward.

The PCs are elite rogues who must complete a ritual in a part-buried planar fortress. The mood might be... deadly serious
There is a rival cleric who wants to do the same thing.
The characters start with the loan or gift of a powerful magic item. Early on they encounter a complex puzzle. If things get stuck an ally turns up with useful information.
At the end there is a reward of an artifact.

The PCs are chaotic humans who must make a bejeweled statue. A character is celebrating a birthday. It might involve genies.
There is a rich sage who falls in love with a character.
The characters start running away from something. Partway through they encounter a magical trap. If things slow down there is a fire.
It finishes with a reward of an audience with someone famous.