Site-wide plots?

Could be something really basic for the first one like maybe an enemy to all the groups that will actually be taken down? Even something basic like that can be made really neat if planned out lightly with a few paths and let the actions of the groups decide which of those paths is taken. If ever needed I could actually design something basic like that, I actually have fun doing such things even though I don't have fun with much else that isn't direct rp setting up the story and paths for an event is just enchanting cause I'm weird.

Other idea's of the top of my head generally revolve on doing something that would push towards laws or something, develop the society around everyone ic, atm, cause its late and I have next to no brain left.