A new League of Legends calendar.

Just a button next to the free champion rotation button or maybe even in the log in screen. In the calendar you can see an update schedule of when new skins are coming, when new game modes are coming, when sales are coming and schedule a champion/skin that you want to buy and get a notification for it. It could also fit in the free champion rotation itself or the PBE updates aswell. Also a cool feature that may be hard to fit is adding how much LP or just how many wins you've had in a day.