My little R&D into wiki domains at http://www.racerkidz.com seems to work fine - I add a feature evry now and then.
You can register a club, describe a racing schedule, then racers can add it to their profile and automatically, via the magic of wiki xpath, see the racing calendar and the map...
You can give it a try without an account from the home page.
I also experimentally used it to create simple blogs, like this enduro school. A blog has posts and that's that, see its domain definition.