Projects contain tasks and people, and in order to get project to do anything you have to add at least one of those. You can invite any of your connections to join a project, and you can create tasks and assign them to anyone who’s part of a project.
Zig offers the most flexible team structures of any collaboration tool. Sure, we built Zig for creative people making TV commercials or indie games, but Zig’s ability to create flexible teams and aggregate information means you can mix and match. You could create a project called “Family” and schedule soccer games, and share shopping lists. You can create a project called “Running Group” and get your friends together to train for a marathon.