Tens of thousands of people are expected to attend next Sunday's commemoration in Dublin to mark the 90th anniversary of the Easter Rising.
The commemoration ceremonies, which will begin at noon at the GPO in O'Connell Street, will be led by President Mary McAleese and Taoiseach Bertie Ahern.
Shortly before noon, the parade, which will include 2,500 members of the Defence Forces, will leave from Dublin Castle and proceed via Dame Street and College Green to Westmoreland Street, where it will pause.
The ceremony at the GPO will start at noon, with the lowering of the national flag to half-mast. A military officer will read the Easter Rising Proclamation. The Taoiseach will then invite the President to lay a wreath.
A minute's silence will be observed for the 1,200 people who were killed or injured in the Rising, including 80 members of the Irish Volunteers.
This figure includes the 16 who were executed by the British in the aftermath of the Rising.
The British army suffered 140 fatalities and 318 members were wounded, while the Royal Irish Constabulary and the Dublin Metropolitan Police lost 17 men.
More than 220 civilians were killed and 600 wounded, although a significant number of other civilian casualties are believed never to have been reported at the time.
At the end of the ceremony the national flag will be returned to full mast and the parade will resume up O'Connell Street to Parnell Square.
Taking part in the parade will be some 2,500 people representing the Army, the Naval Service and the Air Corps, as well as members of the Irish UN Veterans Association and the Organisation of Ex-Servicemen and Ex-Servicewomen.
It will include a display of the Defence Forces' newest military equipment, such as the Mowag troop carriers.
Members of the Garda will also participate, representing the force's role in United Nations peacekeeping missions.
While full details will only be released later this week, it is understood that the public will be allowed to gather along the route. Video screens are to be erected so that people along the route can watch the ceremony at the GPO.
Some 900 invited guests will observe the parade from the reviewing stands in front of the GPO. About half of those will be representatives of the families of volunteers who died in 1916.
The Garda will have a significant presence to try to ensure there is no repeat of the disturbances that stopped the recent Love Ulster parade.
Earlier on Easter Sunday, at 10.30am, the Taoiseach will lay a wreath in Kilmainham Gaol. Only a small number of invited guests will attend.The laurel and floral wreaths to be laid at the GPO and at Kilmainham will symbolise military and civilian victims.
