Meetup is great for users, for individual hosts it's way too expensive. I can't view the current pricing, but my small group closed after I got tired of paying $90/6 months for a glorified email list + calendar.

For companies that's chump change, but for a casual interest group it's too much.

Tried to migrate the core members to Facebook groups which is free, but there wasnt enough interest to keep it active. Friends with a few people still from it though.