Still working on https://radius.to/ - a Meetup.com alternative of sorts - with fairer organiser pricing for smaller groups.
I posted a Show HN [1] here a while back, got tons of great feedback, and have been slowly improving it since, with no real marketing. Another Show HN is probably overdue!
More recently, I've been working on adding features around meeting individuals/smaller impromptu groups over activities you're doing - i.e. "I'm going for a cycle today - who wants to join", so I'm excited to see how that goes. There are some UI examples from that on the landing page.