We will be meeting this Friday, November 4, for a special discussion on E-Graphs and available Racket FFI provisions for Rust's Egg library. Oliver Flatt, who works on some of these things, has kindly agreed to attend and share his experiences with these technologies as they are used in the Herbie library.
Friday Nov 4 at 17:00 UTC 
Meetup time at your location: 2022-11-04T17:00:00Z
Gather.town meetup link
Meeting notes so far.
The topic is not Qi-specific, except that the context of understanding these things is towards potentially using these technologies in the Qi compiler.
All welcome, see you then!