| Midlands Golf Festival, A1:11-15 May | |
| The FBD Insurance RAS - Cycle Race, A1:17-24 May | |
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| Antrim | Annual Tulip Festival, A1:2-4 May | |
| Balmoral Show, A1:13-15 May | |
| Belfast Children's Festival, A1:22-31 May | |
| Belfast City Marathon, A1:4-May | |
| North West 200, A1:9-16 May | |
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| Carlow | Carlow Golf Club Open Week, A1:30 May - 6 June | |
| Carlow Regatta, A1:30-31 May | |
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| Cavan | Breffni Arms Hotel Over 50's Fishing Competition, A1:25-28 May | |
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| Clare | Burren in Bloom Festival, A1:1-31 May | |
| Burren Law School Burren College of Art, A1:1-3 May | |
| Burren Slow Food Festival, A1:15-17 May | |
| Doonbeg International Jazz Festival, A1:29 May - 1 June | |
| Fleadh Nua, A1:17-25 May | |
| Iniscealtra Festival Of Arts, A1:24 May - 1 June | |
| The Burren Landscape Painting Competition and Art Weekend, A1:22-24 May | |
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| Cork | 82nd Cobh Summer Carillon Recital Season, A1:May - September (Sundays 4.30-5.30pm) | |
| Ballydehob International Jazz Festival, A1:1-4 May | |
| Baltimore Seafood and Wooden Boat Festival, A1:22-24 May | |
| Bandon Music Festival, A1:29-31 May | |
| Bay Run 09 - Half Marathon, A1:3-May | |
| Castletownbere Whit Weekend Festival, A1:30-31 May | |
| Commemoration of the Sinking of the RMS Lusitania, A1:4-May | |
| Cork Pride, A1:24 May - 1 June | |
| Fastnet Short Film Festival, A1:14-17 May | |
| Festival of the Galtees, A1:29 May - 1 June | |
| Kinsale Sevens Rugby, A1:1-3 May | |
| Kinsale Vintage & Classic International Car Rally, A1:8-11 May | |
| Ocean to City, A1:30-May | |
| Rosscarbery Festival by the Sea, A1:29-31 May | |
| South of Ireland Festival of Piping and Drumming, A1:30-31 May | |
| The Baltimore Fiddle Fair, A1:7-10 May | |
| Trevor/Bowen Summer School, A1:1-4 May | |
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| Donegal | Beat the Bodhran, A1:29 May - 1 June | |
| Cup of Tae Festival, A1:1-4 May | |
| Dunfanaghy Seafood Festival, A1:29-31 May | |
| The Carr Memorial Traditional Music Weekend, A1:28 May - 1 June | |
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| Down | 11th Annual International Guinness Blues on the Bay Festival, A1:21-25 May | |
| Castle Ward Opera, A1:29 May - 20 June | |
| May Day Celebrations and Fair, A1:4-May | |
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| Dublin | 6th International Dublin Gay Theatre Festival, A1:4-17 May | |
| Antiques, Fine Art and Collectors Fair, A1:17-May | |
| Bloom 2009, A1:28 May - 1 June | |
| Docklands Maritime Festival, A1:29 May - 1 June | |
| Dublin City Soul Picnic, A1:21-24 May | |
| Dublin Dance Festival, A1:9-23 May | |
| Dublin International Toy and Train Fair, A1:24-May | |
| European Winners Dog Show, A1:30 May - 1 June | |
| Heineken Green Energy Festival, A1:2-4 May | |
| Malahide International Festival of Piping & Drumming, A1: | |
| Skerries Traditional Music Weekend, A1:15-17 May | |
| Summer in Dublin Festival, A1:May - September | |
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| Galway | Clifden Jazz & Blues Weekend, A1:29 May - 1 June | |
| Connemara Bog Week, A1:22 May - 1 June | |
| Connemara Mussel Festival, A1:1-3 May | |
| Galway Early Music Festival, A1:15-17 May | |
| Inishbofin Community Arts Festival, A1:9-11 May | |
| The Joe Heaney Commemorative Festival of Traditional Singing, A1:1-3 May | |
| Trad on the Prom, A1:1 May - 30 September (evry Sun, Tues & Thurs) | |
| Volvo Ocean Race 2008-2009, Galway Stopover, A1:23 May - 6 June | |
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| Kerry | Cuckoo Walking Festival, A1:1-4 May | |
| Killarney Horse Racing Festival, A1:10-12 May | |
| Listowel Horse Racing Festival, A1:30 May - 1 June | |
| Listowel Writers' Week, A1:27-31 May | |
| Portmagees 18th Annual Set Dancing & Music Weekend, A1:1-3 May | |
| Rally of Lakes, A1:1-3 May | |
| Siamsa Tire - Summer Season Performances, A1:May - September | |
| World Bodhran Championships, A1:29 May - 1 June | |
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| Kildare | The Boylesports Irish Guineas Festival, A1:23-24 May | |
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| Kilkenny | Carlsberg Kilkenny Rhythm and Roots Festival, A1:1-4 May | |
| Organic Geometry, A1:May - July | |
| Smithwick's Cat Laughs Comedy Festival, A1:28 May - 1 June | |
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| Laois | Gordon Bennett Classic Car Run, A1:29 May - 1 June | |
| Laois International Golf Challenge, A1:18-21 May | |
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| Leitrim | Wise Woman Festival, A1:8-10 May | |
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| Limerick | AIB Rugby - League Finals, A1:9-May | |
| Athea Horse & Pony Races, A1:31-May | |
| Ballyhoura International Walking Festival, A1:1-4 May | |
| Shameful Ideas & Thoughts Dance Festival, A1:5-9 May | |
| The World is One Country , A1:2-3 May | |
| Twilight Summer Festival at Limerick Racecourse, A1:17-May | |
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| Longford | INK National Writers Group Festival, A1:15-17 May | |
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| Louth | Art in Action, A1:30 May - 1 June | |
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| Mayo | Feile Chois Cuain, A1:1-4 May | |
| Feile na Tuaithe - Turlough Park, A1:23-24 May | |
| Guinness Castlebar Blues Festival, A1:29-31 May | |
| The Mask Challenge, A1:16-May | |
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| Meath | Antiques, Fine Art and Collectors Fair, A1:10-May | |
| Loughcrew Festival Opera, A1:29-31 May | |
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| Monaghan | Fiddler of Oriel, A1:1-3 May | |
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| Offaly | 16th Annual Slieve Bloom Walking Festival, A1:1-4 May | |
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| Roscommon | Bling at King House, A1:4-May | |
| Strokestown International Poetry Festival, A1:1-4 May | |
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| Sligo | Ceilliuradh an Earraigh (Spring Festival) , A1:1-3 May | |
| Cos Cos Sean Nos Dance Festival, A1:8-10 May | |
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| Tipperary | Glen of Aherlow Walking Festival, A1:29 May - 1 June | |
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| Waterford | European Geopark Week, A1:23 May - 7 June | |
| John Treacy 10 Mile Classic and 5km Family Fun Run, A1:17-May | |
| The Complete Irish Show - Song, Dance & Storytelling, A1:May - September | |
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