D&D One Shot

The characters are feared kobolds who must destroy a celestial staff. Two of the characters have fallen in love.
It is at a haunted palace which is protected by a gargoyle.
There are a group of angry dockworkers stealing domesticated beasts. And a passionate sheriff seeks to defeat a venerable sahuagin priestess.
At some point they discover a secret door.
As the adventure progresses a portal slowly starts to open

The PCs are imprisoned dwarves who must deliver a bejeweled ring. It might involve earth.
There is a rival warlock who offers them aid.
The characters start outside some ruins. Partway through there is a big fight scene. If things slow down they receive a useful sending spell.
Afterwards there is a newborn or child on the way. Possible sequel... same adventure but everything more dangerous

The PCs are fugitive clerics who must steal a holy spear. One or more characters have cursed magic items. It might involve the Underdark.
There is a drunk warlock who comes with them.
The characters start during an attempted escape. Partway through they encounter a new potential ally. If things get stuck they uncover a secret stockpile.
It finishes with a funeral. Possible sequel... same villain in a new base

The characters are elite elves who must protect a draconic crown. Two of the characters are friendly rivals.
It is at an isolated farm which has a portal to the Pyramid of Hidden Illusion.
There are several drunk elves training a beast. And a tavern seeks to destroy a sacred tree village.
At some point a monster escapes.
As the adventure progresses a portal slowly starts to open

The PCs are troubled lizardfolk who must stop a planar gate from opening. One or more characters has an inquisitive mount. It might involve ghosts.
There is a charismatic bugbear chief who falls in love with a character. they are the employer of a character.
The characters start on the road about to encounter someone. At some point they spot foes who are unaware of them. If things slow down a pet escapes.
At the end there is a reward of a noble title. Possible sequel... same adventure but everything more dangerous