Well hopefully he will be back in action by then, if he is, if it is cold outside wear your winter coat inside the theatre and hide a camera in your pocket( that's how I got my pics that are on my website) even though the signs say no cameras, if ya wait til the 2nd half of the concert most ppl start clicking away.
Bring some ear plugs, cuz you'll be right in front of the HUGE speakers and you'll soon go deaf
And oh ya as soon as the concert is over make a beeline to the backstage door and wait, in about 30-45 min all the guys will be walking out the door.