Nowhere. Should we start something? :)
I'm open to wherever people naturally gather though. IRC, maybe?
Another community you might like: https://www.tinyml.org/
I feel like a lot of ham radio networking is still "offline" from an internet perspective; you may have a LAN or even a WAN but no connection to root DNS or certificate servers or whatever. This tickles my fancy: https://blog.thelifeofkenneth.com/2018/01/off-grid-raspbian-...
I feel like /r/darknetplan is tangentially related, but not quite what I'm looking for.
I've been playing with Internet-in-a-box, which is precisely wrong about its name; it's an offline repository of content that was developed on the internet.
Someday I'd like to marry that with my Othernet receiver, which is a similar offline-hotspot-of-content but keeps that content updated by receiving a satellite data stream. (One-way only.)
Piratebox seems to be a dead project by that name, but I like the idea. A local file repo and possibly bulletin-board for use by folks within range of the box.
Yes, yes, yes, where do we go to chat?
Presumably not online
I've been obsessed with machine learning for embedded systems for years! So many practices around ML assume constant network connection and/or that your service runs in a data-center. I'm an ex-SRE and love building reliable offline computer vision things!