Any updates on this?
(I love the discourse community I’ve created, but getting new people into the community is really challenging. There seems to be no way to auto promote current attendees and new buyers of my courses to a (secret) group —based on an event outside the community (buying my course. And I have stopped sharing the sign up link option, because customers keep using it as a log in link, and then panic when they arrive for the second time and are told they can’t sign up again because they are already logged in.)