Well. I created a gathering. The UI gives me no indication of who can see it; if it's public or private. The UI gives me no indication of how I can "invite" people to it so they can see it (if it's even private).
You could create an issue on the patchwork github issues page (https://github.com/ssbc/patchwork/issues) outlining the changes you'd like to see, if you like :).
And / or start a thread in #new-people on scuttlebutt.
Let me know if you need a hand with any of the setup.