It comes up in chat sometimes, so I figured I'ld post a question and answer on the thing.
On the main page go to chat, then site rooms.
Scroll to the very bottom and create a room.
Once you're in the room, go to info.
Then access, and grant explicit write access.
Then just invite to chat like normal.
Thank you for posting this and for helping me out with that room, however I just tried it and it doesn't work for me. I get "Users must have at least 20 reputation to talk" in big red letters. I wonder if I don't have enough reputation myself to grant write access? May 28, 2012 at 8:58
That's possible I guess. May 28, 2012 at 10:43
2you need a specific amount of rep to create a gallery chat room. if you dont have enough rep you can't give explicit write access.– Thomas Ward ModMay 29, 2012 at 19:59
I believe they imposed a hard limit on 20 now, meta.stackexchange.com/questions/100291/…– MateoFeb 17, 2014 at 7:55
How do you invite the user? Dec 10, 2018 at 12:36