What Big Event Would You Like to See Next?

When I say event, I mean like a Burning Tides event. Something that feels like it advances a story within the world of League. I mean Burning Tides gave us a new Gangplank and disabled him when he was "dead", we got a MF skin that's supposedly her new default in terms of story, and basically got a great story out of it that felt like the world was advancing in something.

So what I want to hear is what big event like this you'd like to see take place. Noxus? Demacia? The Freljord? Or even places that you don't really think about that much like Bandle City or the Kumaguu Jungles? Even better, what would you like to see in that event? To me personally I'd like to see an event either in the Freljord or a conflict between Demacia and Noxus, with a possible death of a champion. And when I mean death I mean "death" death, as in they're dead (at least in terms of the story. They'd of course still be playable in the game).