Will Riot do another charity skin sale soon?

In the past Riot has had skin sales so players could support a charity. I know previously they have benefited Manatee Conservation, The Make-a-Wish Foundation, and relief for Japan after the tsunami (there may be more that I am unaware of).

Are there any plans to do this again soon?

I really like the idea of being able to enjoy this game and support a worthy cause, and it seems like it has been awhile since it was done.