The Fourth International Conference on eXtreme Programming and Agile Processes in Software Engineering
Held the week of May 26, 2003, in Genova, Italy
JoshuaKerievksy is running an excellent session called XpWar. He draws four cards, each describing a problem, and four "celebrities" each argue why their problem is the worst. Audience members cycle through the celebrity chairs.
See also: XpConferences