Which feature you would like next?

Hm. I like the idea of your product and will definitely try it out (been using MeetUp before). But none of the above seems important. To be honest, for a system like bylde (as another honest feedback: this is a really hard to remember name...) I think content (i.e. events) is most important. And to quickly find relevant events (but, I need to try it out first ;-).