Belfast: Tens of thousands attended an open-air concert at Belfast City Hall to celebrate St Patrick's Day. Crowds waving Tricolours were entertained by Six, the winners of Popstars.
Also taking part in the four-hour event were Sinéad Quinn and Malachi Cush, who participated in the BBC programme Fame Academy. There was no parade in Belfast this year but the city-centre came to a standstill for the concert.
Sinn Féin Lord Mayor Mr Alex Maskey said it was an inclusive event. "Respect and tolerance for what is a diverse community has to be the hallmark of everything we do here."
Organiser Ms Irene Sherry denied that the preponderance of Tricolours meant the event effectively excluded the unionist community. St Patrick was the patron saint of Ireland and it wasn't inappropriate that people had chosen to display the national flag.
Tens of thousands of people took part in a parade in Newry, Co Down. Thousands also attended an outdoor concert, featuring the Furey Brothers, in Derry. In Omagh, Co Tyrone, there were re-enactments of scenes from the emigration era at the Ulster-American Folk Park.
The Duke of York made a one-day visit to the North to carry out an engagement with the Royal Irish Regiment, of which he is colonel-in-chief. Prince Andrew was presented with shamrock when he arrived at St Patrick's Barracks in Ballymena, Co Antrim.
The shamrock was presented by the commanding officer's wife, Ms Charlotte Spender. Later he visited Hillsborough Castle, where he met representatives of five local companies which received Queen Elizabeth's award for trading excellence.