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There are multiple theories but broadly it's either a huge show/ritual or something so horrifying and/or secretive that people can't talk about it.
Here's an episode detailing some of it:
https://open.spotify.com/episode/2njQSnM63qnj51js40QXGk?si=j4QemY92TGWmO9wzEqcxBA
Back when I was still reading a lot of stuff, the consensus was that specifying it would essentially ruin it.
I hope that's still the case.
No my knowledge no. I haven't been reading as much as I used to but I think I might have come across it at some point.