Well, one key event is Goku's early battles against various foes. He faces off against enemies like Raditz. Another important part is his training and growth in power during this part of the story.
A plot could revolve around a time - traveling character who goes back to the time of the Tenkaichi tournaments in Dragon Ball Z. This character could accidentally change some events, leading to a whole new set of battles and power - up scenarios. Maybe Goku doesn't get the senzu beans he needs at a crucial moment, forcing the other fighters to step up more.
Vegeta is also highly popular. His pride and his journey from villain to anti - hero are rich areas for fanfiction. Writers can delve into his internal struggles, like his constant need to prove himself stronger than Goku while also dealing with his new - found family on Earth.
The full story of Dragon Ball Z is about Goku and his friends protecting the Earth from various powerful villains. It starts with Raditz arriving on Earth, revealing Goku's Saiyan heritage. Then there are battles against the Saiyans like Vegeta and Nappa. Later, the threat of Frieza emerges on Namek. Goku transforms into a Super Saiyan for the first time to defeat him. There are also the Androids and Cell arcs which bring new challenges.
Dragon Ball Z is not based on real events. It's a creation of the author's imagination, presenting a unique and exciting fictional universe filled with characters and adventures that exist only in the realm of fiction.