Yes I think you are right, boyh0wdy, in emphasizing Don't point that whatever this turns into it cannot turn into a burden. Some amount of "commitment" is probably an inevitable part of any project, but we need to make it easy for people to be absent without feeling guilty, as I would think that marks the line between burden and enjoyment.
it needs to be something that is dominantly pleasurable or it won't become a habit to be there when possible. that's one reason I do think it needs to have a set format (such as reading and talking about a particular doctrine as part of each episode) so we can always expect to learn something from each meeting.
I know in my own experience that what needs to be avoided is the right balance of time between hearing what "new people" have to say vs points from more experienced people. That's where it's going to be necessary to have some way to ensure something of a "minimum quality" to the discussion. But as long as the discussion is 'sincere' I think all of us can get a lot out of it, especially when we think about how we ourselves were just starting at one point, and also when we think about the fact that "if this question is arising in this person's mind then it is something that we can work on improving our presentation of the issue" so that we develop good places to point new people on common questions.