More than 100,000 free tickets have been distributed to music fans for the O2 in the Park event on Sunday which features many of Ireland’s best-known pop and rock artists.
Over 30 acts are lined up to perform during the eight hours of music, including Mundy, Juliet Turner, The Devlins and Picturehouse.
Veteran songstress Lulu is expected to make a special appearance to perform a duet with former Boyzone star Ronan Keating.
Younger fans will also be thrilled by the line-up which includes teen favourites such as Samantha Mumba, Six, Bellefire and Pop Idol star Darius.
Most acts are limited to a maximum of 15 minutes on stage, ensuring all music tastes are catered for.
Gates for the concert open at 11am. The first act is due on stage at midday, with the concert scheduled to finish at 8pm.
The last of the 100,000 free tickets for the O2-sponsored event were distributed earlier this week, following huge public demand.
As a result, the organisers have warned members of the public that only ticket-holders will be admitted to the concert site, which is located near the Ashtown Gate of the Phoenix Park.
However, concert-goers are asked to note that there will be no access to the park via Ashtown Gate.
Gardaí are also advising motorists that traffic restrictions will be in operation around Phoenix Park throughout the weekend.
Although the park will be open to traffic on Sunday, the main thoroughfare between Mountjoy Cross and the Gough Roundabout will be closed.
Parking within the Phoenix Park will not be permitted during the weekend and any illegally-parked vehicles will be towed away.
Many concert-goers are expected to use a shuttle service operated by Dublin Bus from outside the Tara Street Dart station to travel to the venue.
Buses will run until after the end of the concert with return tickets costing E4 for adults and E2 for children.