I'd bring the binoculars if I were you. Better then nothing though. It's gonna be a spectacular show.
Check out these image of Croke Park:
http://www.u2achtung.com/00/u2005/im...Croke_Park.jpg
http://www.teachnet.ie/cnmg/images/O...oke%20Park.jpg
You'd be below that camera point of view and a little to the left, right in the centre but a long way away from the stage.
Phil