There will be an Mp3 Experiment happening in Geneva, Switzerland next Thursday. The event is being organized by a local group. See the Geneva Mp3 Games site for more details (helpful if you speak French!)

The Mp3 Experiment was created by Improv Everywhere in 2004. There have been four installments so far in New York, with a fifth planned for later this year.

The Mp3 Experiment Four
The Mp3 Experiment III
The Mp3 Experiment 2.0
The Mp3 Experiment