Sinn Fein's Martin McGuinness will meet the Queen next week and shake hands in a historic first for the Northern Ireland peace process.
The Northern Ireland Deputy First Minister will attend a cross-border event in Belfast on Wednesday, which will also be attended by Irish President Michael D Higgins.
The initial meeting and handshake between the Queen and the senior Sinn Fein representative is expected to take place in a private room at the beginning of the engagement, sources close to the planning have said.
The meeting is nevertheless being seen as a major milestone in efforts to normalise relations between nationalists and unionists.
Sinn Fein president Gerry Adams confirmed his party's ruling executive had backed the planned meeting.
He added: "This will understandably cause difficulties for some republicans and nationalists, especially for those folks who suffered at the hands of British forces."
The leading peace charity Co-operation Ireland is to host the event, to celebrate arts and culture across the island at Belfast's Lyric Theatre on Wednesday.
Sinn Fein's ruling council, the Ard Comhairle, met for four hours in Dublin yesterday before announcing its decision to accept the invitation made to Mr McGuinness.
Mr Adams said Sinn Fein wanted to see a new republic in which the traditions of orange and green could be brought together in a cordial union.
The Ard Comhairle decision was not unanimous but was a clear majority, the party confirmed.
There has been speculation since the Queen's momentous visit to the Republic of Ireland in May last year that a senior Sinn Fein figure would meet her during the two-day trip planned for Northern Ireland next week to mark the Diamond Jubilee.
Mr McGuinness, a former IRA commander, was always the candidate to shake the Queen's hand, but delicate talks have been going on for months to arrange a suitable occasion.
Sinn Fein has stressed the meeting is not a celebration of the Jubilee.
Mr Adams said of the party's decision: "We don't have to do it. We're doing it because it's the right thing to do, despite the fact that it will cause difficulties for our own folk.
"But it's good for Ireland. It's good for this process we're trying to develop. It's the right time and the right reason. After Martin McGuinness completes this engagement he will be as true, as staunch, as active a republican as he ever was."
It is understood the meeting will take place without cameras being present, before the Queen, Mr McGuinness and other key guests including Mr Higgins and Northern Ireland First Minister Peter Robinson join the main event, which will be covered by the media.
Mr Adams said his party held 40 meetings with republican activists across Ireland yesterday to discuss the issue ahead of the meeting of the Sinn Fein leadership.
It had been believed plans for a 20,000-strong Diamond Jubilee celebration, to be held at Stormont during the Queen's trip, made it more difficult for republicans to hold the meeting there. But an engagement involving not only the Queen but also Ireland's head of state provides a more acceptable backdrop for Sinn Fein.
The handshake will be viewed as another in a long list of dramatic advances in British-Irish relations.
One of the most significant was the Queen laying a wreath at the Garden of Remembrance in Dublin, which honours republicans who died fighting British rule, followed by a tour of the headquarters of the Gaelic Athletic Association, before she spoke Irish at a banquet in her honour.
Mr McGuinness has spoken several times of how he was struck by the Queen's gestures.
Mr Robinson, leader of the Democratic Unionist Party, has said republicans should pay due respect to the Queen as a recognition of her importance to many in Northern Ireland.
The First Minister was among those who said such a meeting would also be difficult for the Queen, given that her own family was hurt by republican violence when the IRA killed Lord Mountbatten in a 1979 bombing in Co Sligo.
Former Cabinet Minister Lord Tebbit, whose wife was paralysed in the 1984 Brighton bombing, said: "Personally, I think it is hopeful that Mr McGuinness has decided, presumably on behalf of Sinn Fein, that he should accept the sovereignty of the Queen over Northern Ireland.
"I hope it will be followed by some further moves to express repentance for violence that was caused by Sinn Fein-IRA."
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