The much awaited and popular ‘My Shop’ event as its known in the LoL community is coming back, the discount will start from 12th of December at 8AM Pacific Time.
The beauty of the Your Shop event is that Riot Games tracks your play history and takes all your decisions into account to decide what characters and skins. E.g. if you overwhelmingly play as one character you are almost guaranteed to get a discounted item for them. However you need at least 6 months of regular gameplay for Riot Games to have enough data for you, gaming publications have speculated.
So grab it while it lasts, you would be stupid to pass on a 70% discount on items you are guaranteed to use.