No one likes it when guests crash the party. Even if they are well-behaved, they might bring unwelcome baggage, causing conflict that will ruin the event.
Try to recall a TV show with such a scenario. If it’s a comedy, then weird and hilarious things will happen, such as drinks being spilled or someone being pushed into the pool.
If it’s a thriller or drama story, then there might be a murder, a theft, or threats to one and all.
Your task is to write a story in which a guest(s) appears at an event without an invitation. Setting is important, but more so the emotions displayed by the host(s) are critical.
The host might try to close the door, keeping that person out. Or she might let the person in, trying to avoid a scene.
The guest should do something outrageous, like swill several bottles of beer or dump over the punch bowl. Maybe toss something on the BBQ that sets the canopy on fire.
You want action followed by reaction.
Have fun with this one.