I used this plugin two years ago with a music festival website, and it was an awesome solution at the time.
However, this plugin has become incredibly broken since then and I'm an inch away from migrating the whole damn thing to Drupal.
a. New errors show up with recent versions of WordPress, specifically saving artists when more than one genre exists. That's not even getting started on other stuff I've encountered and fixed.
b. I've contacted the developer several times with bug fixes and even an offer to co-maintain. While he responded sporadically when I was first talking to him about a year ago, he's since become completely unresponsive.
c. To top it all off, the plugin's WP directory listing has been deactivated recently: http://wordpress.org/extend/plugins/wordtour
It's really too bad -- there aren't really any good plugins that offer a way to create a database of artists connected with events and venues (The closest being events plugins, which often allow events and venues but not listings of artists), plus the connectivity of the content types is a step above what WordPress custom post types are capable of doing.
I think there's enough demand for small and medium-sized festivals for a plugin like this (Maybe moreso than WordTour's primary use case, which seems to be small record companies) to justify its existence; I may ultimately try building a low-cost paid plugin that does something similar (at least, once I finish my current half-dozen programming projects and have a semblance of time on my hands again).
Thanks, WordTour -- it's been a fun (albeit often very frustrating) ride.
(Gil, if you ever end up reading this and are still maintaining WordTour -- apologies, that offer to co-maintain is still open...)