Chroma Sale?

I was just randomly thinking about how Riot had said that they'd be doing two chroma sales a year, so I was wondering if anyone knew/there were any guesstimates of when that's going to happen. Also I forget is it all chromas are available for ip or only some, and if only some why those? Also are the limited time chromas ever brought back during this sale (such as winter wonder soraka)? Just curious, thanks haha.
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