We are still looking for a few more people on our US-based Creative Bukkit server. We are a small group of people, most of whom know each other IRL, looking for more people to build and hang out with. Our ages range from pre-teens to 50s so anyone is welcome if you're friendly. We don't have (or like) formal schemes like building contests; we prefer to build whatever we want, though we sometimes challenge each other. We have recently changed our application process to include a Discord voice chat before we vote on whether to accept a new member, because people keep saying they will talk to us then not talking to us.
Our web page with application questions and rules is at woodspeople.net/everyville. There you can also see some screenshots of the sorts of things we are building. Sometimes we are all on a lot, and sometimes there's nobody around for a while, and we don't mind either way. Life has its seasons. I plan to keep the server going for a good long while just because I like it. Right now I'm working on a fairly exact scale replica of the ancient Egyptian temple complex at Karnak, complete with nerdy tour guide command blocks, and somebody else is building a complete wizard-hideout island. That sort of thing.