Hi, Chris -
It's a good idea, but it's a daunting project to keep a worldwide folk music schedule up-to-date. The PermaThread Index lists a good number of permanent threads that are (almost) all out of date. Bert did a sonderful job of the What's On thread, but he finally ran out of steam because it was just too much to keep up with it.
Susan of DT did a number of PermaThreads, including one on Events that I can't find just now.
That's something we're still kicking around. I think maybe a database will do the trick, but we haven't worked that up yet.
-Joe-