In 1903, St Patrick's Day became an official public holiday in Ireland. This was thanks to the Bank Holiday (Ireland) Act 1903, an act of the United Kingdom Parliament introduced by Irish Member of Parliament James O'Mara. O'Mara later introduced the law which required that public houses be shut on 17 March after drinking got out of hand, a provision that was repealed in the 1970s.
The first St Patrick's Day parade in Ireland was held in Waterford in 1903. The week of St Patrick's Day 1903 had been declared Irish Language Week by the Gaelic League and in Waterford, they opted to have a procession on Sunday 15 March. The procession comprised the Mayor and members of Waterford Corporation, the Trades Hall, the various trade unions and bands who included the 'Barrack St Band' and the 'Thomas Francis Meagher Band'. The parade began at the premises of the Gaelic League in George's St and finished in the Peoples Park, where the public was addressed by the Mayor and other dignitaries. On Tuesday 17 March, most Waterford businesses—including public houses—were closed and marching bands paraded as they had two days previously. The Waterford Trades Hall had been emphatic that the National Holiday be observed.
The British Parliament passed the Third Home Rule Act on 18 September 1914 with an amending Bill for the partition of Ireland introduced by Ulster Unionist MPs, but the Act's implementation was immediately postponed by the Suspensory Act 1914 due to the outbreak of the First World War in the previous month. The majority of nationalists followed their IPP leaders and John Redmond's call to support Britain and the Allied war effort in Irish regiments of the New British Army, the intention being to ensure the commencement of Home Rule after the war.
On St Patrick's Day 1916, the Irish Volunteers—an Irish nationalist paramilitary organization—held parades throughout Ireland. The authorities recorded 38 St Patrick's Day parades, involving 6,000 marchers, almost half of whom were said to be armed. The following month, the Irish Volunteers launched the Easter Rising against British rule. This marked the beginning of the Irish revolutionary period and led to the Irish War of Independence and the Civil War. During this time, St Patrick's Day celebrations in Ireland were muted, although the day was sometimes chosen to hold large political rallies. The celebrations remained low-key after the creation of the Irish Free State; the only state-organized observance was a military procession and trooping of the colors, and an Irish-language mass attended by government ministers.
In April 1916, Irish republicans launched the Easter Rising against British rule and proclaimed an Irish Republic. Although it was crushed after a week of fighting, the Easter Rising and the British response led to greater popular support for Irish independence.
In April 1918, the British Cabinet, in the face of the crisis caused by the German Spring Offensive, attempted with a dual policy to simultaneously link the enactment of conscription into Ireland with the implementation of Home Rule, as outlined in the report of the Irish Convention of 8 April 1918.
While it was not clear in the beginning of 1919 that the Dáil ever intended to gain independence by military means, and war was not explicitly threatened in Sinn Féin's 1918 manifesto, an incident occurred on 21 January 1919, the same day as the First Dáil convened. The Soloheadbeg Ambush, in County Tipperary, was led by Seán Treacy, Séumas Robinson, Seán Hogan and Dan Breen acting on their own initiative.
Sinn Féin won 91% of the seats outside of Ulster on 46.9% of votes cast, but was in a minority in Ulster, where unionists were in a majority. Sinn Féin pledged not to sit in the UK Parliament at Westminster, but rather to set up an Irish Parliament. This parliament, known as the First Dáil, and its ministry, called the Aireacht, consisting only of Sinn Féin members, met at the Mansion House on 21 January 1919.
In March 1920, Tomás Mac Curtain, the Sinn Féin Lord Mayor of Cork, was shot dead in front of his wife at his home, by men with blackened faces who were seen returning to the local police barracks. The jury at the inquest into his death returned a verdict of wilful murder against David Lloyd George (the British Prime Minister) and District Inspector Swanzy, among others. Swanzy was later tracked down and killed in Lisburn, County Antrim. This pattern of killings and reprisals escalated in the second half of 1920 and in 1921.
On 17 July 1920, a British Colonel Gerald Smyth was assassinated by the IRA in the County Club in Cork city in response to a speech that was made to police officers of Listowel who had refused orders to move into the more urban areas, in which he stated "you may make mistakes occasionally, and innocent persons may be shot, but that cannot be helped.
On 9 August 1920, the British Parliament passed the Restoration of Order in Ireland Act. It replaced the trial by jury by courts-martial by regulation for those areas where IRA activity was prevalent.
Then, on 21 November 1920, there was a day of dramatic bloodshed in Dublin. In the early morning, Collins' Squad attempted to wipe out the leading British intelligence operatives in the capital. The Squad shot 19 people, killing 14 and wounding 5. These consisted of British Army officers, police officers and civilians. The dead included members of the Cairo Gang and a courts-martial officer, and were killed at different places around Dublin.
About 300 people had been killed by late 1920, but the conflict escalated in November. On Bloody Sunday in Dublin, 21 November 1920, fourteen British intelligence operatives were assassinated in the morning; then in the afternoon the RIC opened fire on a crowd at a Gaelic football match, killing fourteen civilians and wounding 65. A week later, seventeen Auxiliaries were killed by the IRA in the Kilmichael Ambush in County Cork.
On 28 November 1920, only a week after Bloody Sunday in Dublin, the west Cork unit of the IRA, under Tom Barry, ambushed a patrol of Auxiliaries at Kilmichael in County Cork, killing all but one of the 18-man patrol.
On 10 December 1920, martial law was proclaimed in Counties Cork, Kerry, Limerick and Tipperary in Munster; in January 1921 martial law was extended to the rest of Munster in Counties Clare and Waterford, as well as Counties Kilkenny and Wexford in Leinster.
On 11 December, the centre of Cork City was burnt out by the Black and Tans, who then shot at firefighters trying to tackle the blaze, in reprisal for an IRA ambush in the city on 11 December 1920 which killed one Auxiliary and wounded eleven.
On 19 March 1921, Tom Barry's 100-strong West Cork IRA unit fought an action against 1,200 British troops – the Crossbarry Ambush. Barry's men narrowly avoided being trapped by converging British columns and inflicted between ten and thirty killed on the British side.
A general election for the Parliament of Southern Ireland was held on 13 May. Sinn Féin won 124 of the new parliament's 128 seats unopposed, but its elected members refused to take their seats.
The biggest single loss for the IRA, however, came in Dublin. On 25 May 1921, several hundred IRA men from the Dublin Brigade occupied and burned the Custom House (the center of local government in Ireland) in Dublin city center. Symbolically, this was intended to show that British rule in Ireland was untenable. However, from a military point of view, it was a heavy defeat in which five IRA men were killed and over eighty captured.
On 6 June 1921, the British made their first conciliatory gesture, calling off the policy of house burnings as reprisals. On the other side, IRA leaders and in particular Michael Collins, felt that the IRA as it was then organized could not continue indefinitely. It had been hard-pressed by the deployment of more regular British soldiers to Ireland and by the lack of arms and ammunition.
On 24 June 1921, the British Coalition Government's Cabinet decided to propose talks with the leader of Sinn Féin. Coalition Liberals and Unionists agreed that an offer to negotiate would strengthen the Government's position if Sinn Féin refused.
On 18 February 1922, Ernie O'Malley's IRA unit raided the RIC barracks at Clonmel, taking 40 policemen prisoner and seizing over 600 weapons and thousands of rounds of ammunition.
On 17 June, in revenge for the killing of two Catholics by the B-Specials, Frank Aiken's IRA unit shot ten Protestant civilians, killing six in and around Altnaveigh, south Armagh. Three Special Constables were also killed in the shootings.
On 6 December 1922, following the coming into legal existence of the Irish Free State, W. T. Cosgrave became President of the Executive Council, the first internationally recognized head of an independent Irish government.
The church calendar avoids the observance of saints' feasts during certain solemnities, moving the saint's day to a time outside those periods. St Patrick's Day is occasionally affected by this requirement, when 17 March falls during Holy Week. This happened in 1940 when Saint Patrick's Day was observed on 3 April to avoid it coinciding with Palm Sunday, and again in 2008, where it was officially observed on 15 March. St Patrick's Day will not fall within Holy Week again until 2160. However, the popular festivities may still be held on 17 March or on a weekend near to the feast day.
Air India Flight 182, a Boeing 747-237B, crashed off the southwest coast of Ireland on June 23, 1985, when a bomb exploded in the cargo hold. All 307 passengers and 22 crew members died. One passenger had checked in as "M. Singh". Singh did not board the flight. His suitcase containing the bomb was loaded onto the plane, however. "Mr. Singh" was never identified or captured. It was later determined Sikh extremists were behind the bombing as a retaliation for the Indian government's attack on the Golden Temple in the city of Amritsar, which is very important for the Sikhs. This was, at the time, the deadliest terrorist attack involving an airplane.
The first St Patrick's Festival was held on 17 March 1996. In 1997, it became a three-day event, and by 2000 it was a four-day event. By 2006, the festival was five days long; more than 675,000 people attended the 2009 parade. Overall 2009's five-day festival saw almost 1 million visitors, who took part in festivities that included concerts, outdoor theatre performances, and fireworks. The Skyfest which ran from 2006 to 2012 formed the centerpiece of the St Patrick's festival.
On two occasions, parades across the Republic of Ireland have been canceled from taking place on St Patrick´s Day, with both years involving health and safety reasons. In 2001, as a precaution to the foot-and-mouth outbreak, St Patrick´s Day celebrations were postponed to May
In Europe, Riot Games initially signed an international licensing partnership with GOA, the video games department of Orange's Content Division, and Europe's largest gaming portal. On October 13, 2009, GOA and Riot announced that they would start channeling server access for players located in Europe to GOA's dedicated servers. This partnership did not last; on May 10, 2010, Riot Games announced that they would take over the distribution and operation of the game in Europe. To do so, Riot Games established a European HQ in Dublin.
In the 21st century, historical plaques were installed on buildings in Cork and Waterford, Ireland, and London to celebrate Douglass's visit: the first is on the Imperial Hotel in Cork and was unveiled on August 31, 2012; the second is on the facade of Waterford City Hall and was unveiled on October 7, 2013. It commemorates his speech there on October 9, 1845. The third plaque adorns Nell Gwynn House, South Kensington in London, where Douglass stayed with the British abolitionist George Thompson. A plaque on Gilmore Place in Edinburgh marks his stay there in 1846.