May 2004 — The Czech Republic, Estonia, Cyprus, Latvia, Lithuania, Hungary, Malta, Poland, Slovenia and Slovakia join the EU.
Bealtaine 2004 — Thánig an Chipir, Poblacht na Seice, an Eastóin, An Ungáir, An Laitvia, An Liotuáin, Málta, An Pholainn, an tSlóvaic agus an tSlóivéin isteach san AE.