this was an unhelpful comment, removed and replaced by this comment
In kinda answer to your question;
Background: I run a lesswrong group - we are not on meetup. I have run other groups in the past and attend several groups as well.
From another LW group; and something I take to be true; (from the inside of a group) meetup seems to cross promote your group to many many people; whether they are relevant people or not; is not up to meetup to deal with. They then show up; and realise that they are not quite the target; then leave. In the mean-time your group gets diluted while the meetup-style deluge of people appear and di...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.