How do events work?

I need a certain event to occur in order to do a thing. My question is, do events occur upon loading a save? As in i can just hit retry and get a different event (if any). Or is it tied to that specific outpost, staying the same once you create a game, regardless of if you reload or not. I guess it could also be created once you enter an outpost, so you could leave and reenter to reset it, but i doubt they’d do that.

Tldr, i need to re roll events, how can i do that if at all possible?

Edit: solved. No re rolls to my knowledge