So one question for an event

The correct question does not include "when" as nothing is certain. The only reason there would be a rune wars event is if Riot had a reason to explore that lore. Unless a giant lore release or new champion come out related to the rune wars, and even then it is unlikely we would get a lore related gameplay mode, it is most likely not going to happen.

Event questions do not belong in Story,Art and Sound.... Depending on the question they belong in General Discussion or Ask the Community. Feel free to remove your thread and post it there.