Re: Travelling to Ireland
Stranraer is probably cheaper, then drive down from Belfast. Although i flew to Belfast last September for £60 return with Easyjet, although that's Belfast int not George Best.
Re: Travelling to Ireland
Might be worth checking an outfit like Nutt Travel to see what they can offer (if anything) - Travelling by car? Shame, as if going by bike you could have had a nice ride through Wales to either Holyhead or Fishguard
Re: Travelling to Ireland
As Scotty said plus there is also Pembroke Dock to Fishguard which is Irish ferries and not much longer sailing than Fishguard which is Stenaline. The time you're travelling Stenaline do a seacat from Fishguard to Rosslare.
Rosslare to Kildare is only about 65 miles.
Aer lingus is starting a service from Bristol to Dublin and there is also ryanair, I think there is a shuttle bus laid on from airport to festival, but best check! :)