The newly added names are Paddy Casey, Damien Dempsey and The Stands.
The join acts including Bob Dylan, Counting Crows, Christy Moore, Delays, John Prine, Laura Cantrell Band, Kathryn Williams, and Nick Harper on the two stages. For the line-up announced so far, click here.
Tickets are on sale, priced at £38.50. Click on the link to the side of the page to buy online.