You can see U2 here:
June 30, July 2 Barcelona, Spain @ Nou Camp
July 7-8 Milan, Italy @ San Siro
July 11-12 Paris, France @ Stade De France
July 15 Nice, France @ Parc Charles Ehrmann
July 18 Berlin, Germany @ Olympic Stadium
July 20-21 Amsterdam, Netherlands @ Arena
July 24-25, 27 Dublin, Ireland @ Croke Park
July 31-Aug. 1 Gothenburg, Sweden @ Ullevi
Aug. 3 Gelsenkirchen, Germany @ Veltins-Arena
Aug. 6 Chorzow, Poland @ Slaski Stadium
Aug. 9-10 Zagreb, Croatia @ Maksimir Stadium
Aug. 14-15 London, England @ Wembley Stadium
Aug. 18 Glasgow, Scotland @ Hampden Park
Aug. 20 Sheffield, England @ Don Valley Stadium
Aug. 22 Cardiff, Wales @ Millennium Stadium
Sept. 12-13 Chicago, IL @ Soldier Field
Sept. 16-17 Toronto, ON @ Rogers Centre
Sept. 20-21 Boston, MA @ Gillette Stadium
Sept. 24-25 New York, NY @ Giants Stadium
Sept. 29 Hyattsville, MD @ FedEx Field
Oct. 1 Charlottesville, VA @ Scott Stadium
Oct. 6 Atlanta, GA @ Georgia Dome
Oct. 9 Tampa, FL @ Raymond James Stadium
Oct. 25 Pasadena, CA @ Rose Bowl
Oct. 28 Vancouver, BC @ BC Place Stadium