Croke Park is a bit different though. For a start it is horseshoe shaped so pretty much perfect for a concert with the stage at one end and pretty much every seat available. It is also the biggest Stadium in the area.
The other thing is that Stadium concerts are very rare. In the City we have Goodison, Anfield and Aintree but there have been very few major concerts at any of them. Sadly if you were going to hold a major concert in the North West then you would choose Old Trafford because it has a bigger capacity, has a far better catchment area and better transport links.