Next 2 for 1 rune page sale?

Hey, is there any news on when the next 2 for 1 rune page sale will be? I know the last one was not that long ago (Januari) but I missed that one because there was no seperate anouncement and I didn't read the new season big sales page because I thought all of those sales were RP. I will not make that mistake again, though, as I've been waiting for it since last year August.

I'm just curious and I also want to know if I should save 18k IP already or not. Based on how frequently the sales occur, I doubt it will be soon, though (I'm guessing August-september) but I guess asking never hurts, right?