Racket discourse now has chat.
You can get to it via the little speech bubble in the page banner
Pic: Racket discourse banner with chat tooltip over the chat icon
Direct link https://racket.discourse.group/chat
It supports channels, as well as individual and group chats.
Discourse is open source (GPL2+) and the Racket server has no ads or trackers.
Racket has a lot of chat options including discord, slack and the IRC racket - so you can use what works best for you. Links and more at https://racket-lang.org/#community
Best regards,
Stephen 