I'm going to see U2 @ the Palace of Auburn Hills, Michigan, and I got floor tickets for the first time. How early should I arrive to wait in line to get reasonably close to the stage? I don't want to wait 12 hours to be the first person in line, but I would like to be close enough to be wow-ed. Also can we bring chairs while we wait in line, and then have one person run them back to the car before the show? Any help is greatly appreciated. Thanks.