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Currently ESEA is holding a vote of which game to pick up. This online league is the main host for counter-strike anywhere and also hosts sc2 and TF2 but I think they are doing a vote on replacing sc2 with dota/LoL or keeping sc2.
I do not know all the details but for counter-strike they do 8 week online season with playoffs, then a lan for money. If you want LoL to be a game they host. vote here