Lets make old seasons of LoL playable

If anyone (programmers) want to figure out how to load up past instance of League of Legends lets talk about it here.

I reallllly want to play Season 3 or Season 4. Especially revisit the old days before my favorite champion Fiora got reworked.

I know that the LCS often plays on local instances of the game that are running older versions of LoL, therefore it must be possible for us to find a way to do it. It would be amazing to play an old Season on a LAN with friends.

Post up your ideas on if we can make this happen. Even better if Riot tells us if this can be achieved.