This is a one day event. I have a Tier 2 ticket. VIP tickets are also available offering a separate area with sheltered comfortable seating areas, nicer loos and shorter queues for the bar and food. I did not buy a VIP ticket, I'll rough it for the day with the great unwashed!
I'll make a plan nearer the time regarding time & place to meet, what to bring etc.
For more info google Retro Restival Ireland and Retro Festival Ireland Facebook page