The High Sheriff of Belfast Councillor John Hussey will don ceremonial robes for a re-reading of the Accession Proclamation at Belfast City Hall on Sunday afternoon before a special meeting of Belfast City Council.
It follows the passing of Queen Elizabeth II on Thursday at the age of 96.
Official Proclamations will be read across the UK at 12pm on Sunday – at Royal Hillsborough and in Edinburgh and Cardiff - following the reading of the Principal Proclamation of the new King, Charles III, at St James’ Palace in the City of London on Saturday.
Read more: The Queen's funeral date officially declared as a Bank Holiday
The High Sheriff will be joined by The Lord Lieutenant of the Co Borough of Belfast, Dame Fionnuala Jay-O’Boyle for the re-reading of the Proclamation in Belfast City Hall at 3pm.
Members of the public are welcome to attend.
A similar event will be held in Antrim Castle Gardens, also on Sunday at 3pm.
Following the re-reading of the Proclamation, members of Belfast City Council will meet in the Council Chamber for a special meeting to pay tribute to the late Queen.
The meeting will be live streamed on the council’s website from 3.30pm.
On Friday, the Lord Mayor of Belfast Councillor Christina Black was joined by the Lord Lieutenant of the Co Borough of Belfast to open books of condolence at City Hall.
Members of the public have been visiting City Hall to sign the books and leave their own personal tributes.
City Hall will be open until 8pm on Sunday for people wishing to sign the books of condolence. The building will also be open Monday to Friday from 9.30am-8pm.
People have also been leaving floral tributes in the Garden of Remembrance, which is open 7am-8pm daily.
The Union flag will be flown at City Hall until the morning after the Queen’s state funeral, in line with Royal protocol
The day of the Queen's funeral has officially been declared a Bank Holiday, King Charles III has confirmed.
His majesty was proclaimed on Saturday morning at the Accession Council, two days after the death of his mother.
During proceedings at St James's Palace, The King approved an order for the day of the Queen’s funeral will be a bank holiday.
Elsewhere, hundreds of people gathered at the gates of Hillsborough Castle, the royal residence in Northern Ireland, as King Charles was proclaimed the new monarch.
For the second time in two days, the sound of a gun salute reverberated around the Co Down village.
But while Friday's 96-round salute was in memory of the late Queen, Saturday's 21-gun salute marked the reign of a new King.
The union flag on top of the castle was temporarily moved to the top of the mast.
The sea of floral tributes at the gates of Hillsborough Castle continues to grow, with bouquets and tributes now carpeting much of the tarmac and grass in the front area.
The public are being invited to come and pay their respects, but a significant security operation is under way in the village, with traffic restrictions and a shuttle bus service to take people to and from the castle.
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