Free week list?

You know, like when they do the champs and skins that will be on sale. Why not do a free week one? That way we know when champs are going to be free week and don't buy them only to find we don't like them and have them free week the week after.

I literally almost did that with Aatrox here. He's on the free week tomorrow, just checked the news and I'm like "oh thank the lord I didn't waste my money"