Thousands of people will be enjoying music, theatre and comedy events over the bank holiday.
In Dublin the Heineken Green Energy Festival starts today with Alice Cooper, Josh Ritter, HIM, Amy Winehouse, Hal and The Revs.
It continues until Monday with musicians such as Morrissey, Iggy Pop & the Stooges, the Peaches and The Streets.
Britney Spears will perform on Sunday in Dublin after three Irish gigs last week.
In Cork the Murphy's Uncorked Festival opens with Irish and International Comedy & Music. Also in Cork, a Two Time Polka music festival begins today and will tour to Kilkenny as well on Monday.
The Murphy's Cat Laughs Comedy Festival starts today in Kilkenny city and features more than 60 comedians, including Milton Jones, Louis CK and Boothby Graffoe. Kilkenny will also host a screening of Harvey Pekar's American Splendour at Screen Three on Saturday. Songwriter Eleanor McEvoy will be in Limerick tomorrow to play upstairs in Dolans.
Galway will have some interesting events this weekend, too, with a brass band playing in St. Patrick's church in Forster Street, and Mancunian acoustic types are to feature in Bar Cuba.
In Clare Sunday's Cuirt Iniscealtra will be hosted by fiddler Martin Hayes in the Mountshannon Hotel.
On Sunday at Oxmantown Hall, Birr, Fergus O'Carroll is to play the Horn Concerto No 4 plus Tchaikovsky, Bizet, Schubert and Beethoven.
Magic-Net, a European network of 15 participating theatres, will explore the cultural heritage of growing up in Europe by celebrating the 3rd annual festival in Cork.
Today children in Armagh will enjoy The Magic Hat, a show with circus skills and illusions, and in Waterford the students of Braam School of Dance and Theatre will perform an interpretation of Shakespeare's A Midsummer Night's Dream.
Full listings in The Ticket