@andre2907
Look here! 
@faninteraction
The question is, what do you mean by that? Talking to the fans from the stage? What really impressed me was the audience/artist interaction at a Gwen Stefani concert I attended. (The Sweet Escape Tour 2007) I don't know how it usually works with her, but it was the first time I saw an artist actually running through an arena, touching the fans, standing next to them in the stands! It was marvelous and I really couldn't believe it. It worked out great. I call that fan interaction. Of course, this could also go the wrong way, you never know. It's much easier to do in a small venue, though.
Arena tours always work better if you want to be closer to the Fans. Nobody can tell me that people high up in Tokyo Dome actually see details, they have to watch the screens. Then you have other possibilities like going high up in balloons, like Arashi did. But from numerous concert reviews I read (for Johnny's Concert in Tokyo Dome) the best seats are still on the ground.