D&D One Shot

The characters are notable saviours of a nation who must recover a gnomish amulet. A character is being hunted by a faction.
It is at a hidden graveyard which has a festival that is held annual.
There are a family of elves stealing domesticated beasts. And a friendly warlord wants to deliver a shadow-attuned shield.
At some point a new adventurer turns up.
As the adventure progresses there is a series of murders

The PCs are successful witch hunters who must survive a magical plague. A character is accompanied by an annoying friend. It might involve romance.
There is a traveling villain who wants to do the same thing. they are the mentor of a character.
The characters start on a sinking vessel. Partway through an ally turns out to be an enemy. If things slow down something attacks characters.
It finishes with an idyllic rural scene. Possible sequel... an evil organisation's plans were ruined and try to take revenge on the characters

The PCs are retired fighters who must investigate the history of an unholy axe. The mood might be... deep
There is a charismatic cleric who wants to do the same thing.
The characters start camped and about to be attacked. Partway through there is a romantic complication. If things are going nowhere someone hears a useful poem.
Afterwards there is a wedding.

The PCs are blessed monster hunters who must give something to a mutant circus. It might involve elemental fire.
There is a well-dressed barbarian who has important information for them. they are the close relations of a character.
The characters start running away from something. At some point they encounter a new potential ally. If things slow down there is a explosion.
At the end there is one character narrating about all of the others.

The PCs are notable cabal of arcane spellcasters who must collect a bounty on a celestial chasm. It might involve romance.
There is a talkative paladin who works against them.
The characters start at a party that is disturbed. Partway through they encounter a pit trap. If things get stuck a ghost gives them aid.
At the end there is a funeral.