> Everyone here only hangs out with their family and school/university mates and that's it.

If you can get a few people from 2 of these groups together more than once, you've started solving this problem. Of course keeping it going for a long time is a challenge, and you want to avoid always being in the situation where you are doing all the work and others aren't contributing, but it gets easier and better with experience.

Except that if you're not anyone's family and not in university anymore then you're shit out of luck as people in their 30s already have their social circles already completed and don't have space, time and energy to add new strangers when they barely have free time to hang out with their existing clique.