I have a philosophy meetup group, of a few months old, with 6 members now (incuding me). During our last meetup (visited by 5) we set a date for the next meetup, which is in 3 weeks. For that meetup, only 1 member apart from me has RSVPd up till now. I did announce the meetup (via the meetup.com "announce" button plus also an email to each member).
Granted, the meeting is still 3 weeks away, but I'm wondering why the other members do not RSVP (this is different from my experience with the 4 previous meetings). Also granted, the group is small, but I'm trying to get meetups off the ground here and am getting a bit tired of one-to-one meetings between me and only one other member, and personally I find a meeting of at least 3 more fun.
What do I do? Should I in one way or another, maybe 10 days or so before the meeting, gently urge the members to give their RSVPs or advertize to them the fact that I'll be considering canceling the meeting if fewer than 3 have RSVPd by this or that date? Or is it better to tell them nothing and just cancel the meeting if 3 days before the meeting still no additional members have RSVPd? Is it possible in the meetup.com machinery to set a minimum number of attendees for a meeting?