Question: When did the bombing event that was marked in a special program of The Late Late Tribute Shows six months later occur?

full_context: Document 1: Omagh bombing: The Omagh bombing was a car bombing that took place on 15 August 1998 in Omagh, County Tyrone, Northern Ireland. It was carried out by a group calling themselves the Real Irish Republican Army, a Provisional Irish Republican Army (IRA) splinter group who opposed the IRA's ceasefire and the Good Friday Agreement. The bombing killed 29 people (including a woman pregnant with twins) as well as injuring some 220 others, a death toll even higher than that of any single incident during what were considered 'the Troubles' (1968-10 April 1998). Telephoned warnings had been sent about 40 minutes beforehand, but were claimed to be inaccurate and police had inadvertently moved people towards the bomb.
Document 2: The Tribute Show: The TRIBUTE Show™ is an Australian TV show that was created in 2011 and is locally produced on community television. It was originally scheduled for C31 Melbourne. But in early 2012 decided to move to the Foxtel, Austar and Optus Cable & Satellite Networks. It screened on the Aurora Community Channel, which is viewed on channel 183 on Australian cable service Foxtel. In 2013 the show decided to try a different direction and move to all free to air stations across Australia.
Document 3: The Late Late Tribute Shows: The Late Late Tribute Shows are a series of special editions of the world's longest-running chat show, "The Late Late Show" broadcast on RTÉ One in Ireland each Friday evening. Over decades the shows has featured a broad range of well-known public figures including Micheál Mac Liammóir, Joe Dolan, Maureen Potter, Michael O'Hehir, Brian Lenihan, Jimmy Magee, Christy Moore, Mike Murphy and Paul McGrath. In 1999, there was a special programme marking six months since the Omagh bombing and there was also a special show in the wake of 9/11. There were also tribute shows celebrating Irish music and a "Late Late Show" special devoted to Irish comedians. Individual bands and musicians to have been given a tribute show include The Clancy Brothers and Tommy Makem, The Chieftains, The Dubliners, U2, Westlife and, most recently, Ronnie Drew himself.
Document 4: The Troubles in Magherafelt: A total of eleven people were killed in violence relating to the Northern Irish Troubles in the town of Magherafelt, County Londonderry. Nine were killed by the Irish Republican Army (IRA), including three IRA members killed by the premature explosion of their own bomb while travelling through Magherafelt. One was killed by a non-specific republican group and another by the opposing Ulster Freedom Fighters (UFF). Of the others killed by the IRA, four were Protestant civilians. Three of them were killed in two separate car bomb explosions. The fourth Protestant civilian was shot because his firm was a contractor for the British Army and the Royal Ulster Constabulary (RUC). The IRA's other two victims were both Protestant members of the security forces, one from the RUC and the other from the Ulster Defence Regiment. Both were off duty when killed. The man killed by the UFF was a Sinn Féin councillor who was shot in his workplace. The man killed by the non-specific republican group was a Catholic civilian.
Document 5: Eamonn Andrews Studios: Eamonn Andrews Studios was founded by broadcaster Eamonn Andrews, famous for being the presenter with the big red book of "This Is Your Life," a British television programme. In the 1960s, the launch of television in Ireland led him to become the Chairman of the RTÉ Authority. He set up a media production company in Ireland, the Eamonn Andrews Studios, which ran a dance hall called The Television Club in Harcourt Street in Dublin and took on the lease of the Gaiety Theatre in Dublin. Eamonn Andrews Studios were originally located at 40 Henry Street in Dublin. In the 1960s the company bought the TV Club building on Harcourt Street. It was located directly opposite, what was then, the Old Harcourt Street Station. It housed two distinctly different studios. A radio studio which recorded sponsored programmes for Radio Éireann, and commercials, and a band studio down stairs. It used the dance hall during the day to record all the main bands of the Showband era. At nighttime, the bands were showcased live on stage in what the company called "The Mecca of Irish Nightlife".
Document 6: Ed Sullivan: Edward Vincent Sullivan (September 28, 1901 – October 13, 1974) was an American television personality, sports and entertainment reporter, and longtime syndicated columnist for the "New York Daily News" and the Chicago Tribune New York News Syndicate. He is principally remembered as the creator and host of the television variety program "The Toast of the Town", later popularly—and, eventually, officially—renamed "The Ed Sullivan Show". Broadcast for 23 years from 1948 to 1971, it set a record as the longest-running variety show in US broadcast history. "It was, by almost any measure, the last great TV show," proclaimed television critic David Hinckley. "It's one of our fondest, dearest pop culture memories."
Document 7: Timeline of Real Irish Republican Army actions: This is a timeline of actions by the Real Irish Republican Army, also called the Real IRA, an Irish republican paramilitary group. The group was formed in late 1997 by members of the Provisional Irish Republican Army who disagreed with that organisation's ceasefire.
Document 8: McGurk's Bar bombing: On 4 December 1971, the Ulster Volunteer Force (UVF), an Ulster loyalist paramilitary group, detonated a bomb at McGurk's Bar in Belfast, Northern Ireland. The pub was frequented by Irish Catholics/nationalists. The explosion caused the building to collapse, killing fifteen Catholic civilians—including two children—and wounding seventeen more. It was the deadliest attack in Belfast during the Troubles.
Document 9: Real Irish Republican Army: The Real Irish Republican Army or Real IRA (RIRA), is a dissident Irish republican paramilitary organisation which aims to bring about a united Ireland. It formed in 1997 following a split in the Provisional IRA by dissident members, who rejected the IRA's ceasefire that year. Like the Provisional IRA before it, the RIRA sees itself as the only rightful successor to the original Irish Republican Army and styles itself as "the Real Irish Republican Army" in English or "Óglaigh na hÉireann" in Irish. It is an illegal organisation in the Republic of Ireland and designated as proscribed terrorist organisation in the United Kingdom and the United States.
Document 10: Dubliners 50 Years Anniversary Tour: The Dubliners 50th Anniversary Tour was a tour in 2012 by The Dubliners celebrating 50 years. The group was awarded a lifetime achievement award by BBC Radio 2 in February. However, in April, founding member and tenor banjo player Barney McKenna died. Banjo player Gerry O'Connor filled his place until the end of the tour. In November the group released the album "50 Years" charting in the Irish Top 10. John Sheahan after 48 years decided he could no longer continue with the band due to the death of Barney McKenna. In December the group played its final concerts at Vicar Street and were joined on stage by Jim McCann. The band met with President Michael Higgins in the presidential palace in Dublin. The group appeared on BBC's "Jools Holland Annual Hootenanny" on New Year's Eve. With the exception of John Sheahan, the rest of the group continues touring as The Dublin Legends - Spirit of the Dubliners.
Document 11: Ballygawley bus bombing: The Ballygawley bus bombing was a roadside bomb attack by the Provisional Irish Republican Army (IRA) on a bus carrying British soldiers in Northern Ireland. It occurred in the early hours of 20 August 1988 in the townland of Curr near Ballygawley, County Tyrone. The attack killed eight soldiers and wounded another 28. It was the second-deadliest attack on the British Army in Northern Ireland during the Troubles, after the Warrenpoint ambush of 1979. In the wake of the bombing the British Army began ferrying its troops in and out of County Tyrone by helicopter.
Document 12: 2006 Meteor Awards: The 2006 Meteor Music Awards took place in the Point Theatre, Dublin on 2 February 2006. It was the sixth edition of Ireland's national music awards. The event was later aired on RTÉ Two on at 21:00 on Sunday 5 February. The awards show was hosted by the comedian Patrick Kielty. A total of seventeen awards were presented at the ceremony. U2 were the largest winners at the 2006 awards, receiving three gongs, Best Irish Band, Best Irish Album for "How to Dismantle an Atomic Bomb" and Best Live Performance for their 2005 Croke Park shows. The band's bassist Adam Clayton attended the show and picked up the awards. The four international awards were divided between Kanye West (Best International Male), Gwen Stefani (Best International Female) and Kaiser Chiefs (Best International Band and Best International Album for "Employment"). The Pogues were presented with the Lifetime Achievement Award, whilst Today FM presenter Ray D'Arcy was named Best Irish DJ for a second consecutive year. After the awards Louis Walsh was caught red-handed in an embarrassing situation with Kerry Katona when he gripped her from behind and did something naughty and rude.
Document 13: Dissident republican: Dissident republicans, renegade republicans, anti-Agreement republicans or anti-ceasefire republicans (Irish: "poblachtach easaontach" ) are Irish republicans who do not support the current peace agreements in Northern Ireland. The agreements followed a 30-year conflict known as the Troubles, which claimed over 3,500 lives. During the conflict, republican paramilitary groups such as the Provisional Irish Republican Army waged a campaign to bring about a united Irish republic. Peace negotiations in the 1990s led to an IRA ceasefire in 1994 and to the Good Friday Agreement of 1998. Mainstream republicans, represented by Sinn Féin, supported the Agreement as a means of achieving Irish unity peacefully. 'Dissidents' saw this as an abandonment of republican ideals and acceptance of partition and British rule. They hold that the Northern Ireland Assembly and Police Service of Northern Ireland (PSNI) are illegitimate and see the PSNI as a "British paramilitary police force".
Document 14: The Troubles in Limavady: Four people were killed in violence relating to the Northern Ireland Troubles in the town of Limavady, County Londonderry. All were Protestants, and all were killed by the Provisional Irish Republican Army (PIRA, better known as the IRA). One was a prison officer and one was a Royal Ulster Constabulary (RUC) officer. The other two victims were civilians killed by a van bomb explosion outside the Limavady RUC base on 28 March 1972. They were driving past at the time of the attack.
Document 15: The Saturday Night Show: The Saturday Night Show is a talk show hosted by Brendan O'Connor broadcast on RTÉ One between 2010 and 2015. The show features guest interviews, audience participation and live music. "The Saturday Night Show" is broadcast every Saturday night during the autumn-spring season directly after "", the main evening news bulletin.
ground_truth: 15 August 1998