Recommender systems meet festivals

In the first of my scenarios from the "cutting room floor" I described a festival where friends clustered around their interests and discussed what they would go and see. Part of this was a portable recommender system that already knew your cultural preferences and matched them against what was on at the festival. Now, with its Last.fm goes to Austin feature, there's exactly that kind of service for the South by SouthWest festival next week.

Does anyone know of other applications of recommender systems for festivals?

As a regular gig goer Last.fm's mapping of events to my listening habits and friends is one of the most valuable and truly social functions that it provides. It's about connecting with culture through people and connecting with people through culture.