Escape From Camazotz Episode Prediction.
I wrote this theory in the comment section of an amazing YouTube Channel, Stranger Universe. So I'll post it over here.
So, I suspect that Camazots refers to the Upside Down and is where Holly Wheeler is trapped in and probably calls it that based on the book 'A Wrinkle In Time' she reads. So the gang goes to the alternate dimension to save Holly while they try to evade hoards of monsters and possibly the Mind Flayer.
Meanwhile, in a parallel sequence in the episode (also based off of supposed leaks from a Reddit post), Max and Eleven are in Vecna's Mindscape exploring a mental version of Hawkins in the 1950s where they witness replayed memories of Henry Creel's life and scenes from the stage play 'The First Shadow.'
If this is true, it would be one of the most memorable and visually creative episodes in the series based on the contrasting scenes of dimensions. The Upside Down and the 1950s mental realm of Hawkins.
Or, it could be the other way around with Camazotz being given to Henry's mindscape version of Hawkins in the 1950s.