Coolest thing last night; a couple migrated up the front where I was, one back from the rail. The guy explained to me that the lady he was with was deaf. They wanted to get close to stage so she could feel the vibration of the music. I suggested that she needed to have a balloon to hold to better feel the vibrations. (Saw it on the documentary, long, strange trip.) he thought that was a great idea, explained it to her. A guy standing nearby heard us and walked off, came back in a moment with a balloon for her. Pretty cool, was glad to help.