Around 60,000 rock fans are expected at Slane Castle tomorrow for the annual concert in Lord Henry Mountcharles' back garden.
Stereophonics are this year's headliner with support from Nickelback, The Charlatans, Ocean Colour Scene, Doves, Counting Crows and The Revs.
This year's event marks the 21st anniversary of concerts at Slane.
The natural amphitheatre in County Meath has played host to U2, The Verve, Oasis, Robbie Williams, REM, Bob Dylan, Bruce Springsteen and Thin Lizzy over the years.
Dublin Bus is providing over 200 buses to the venue. Traffic restrictions around Slane village will be in place.