I'm planning on running a gameshow/tournament style one shot, which would mostly be PVE but would end in a PVP style battle royal. I was thinking there could be different opportunities for individual players to earn gold/points to spend at an item shop before the final match, to balance out the classes and add some fun to the mix.
2 Minute Tabletop has a great module you can run. I just ran this with my family on vacation when we were looking for something to do in the evenings. I extended it a lot with some fetch quests before the tournament, and everyone had a good time learning their characters/practicing their mechanics.