The formal proclamation of King Charles III will be televised for the first time in history.
Clarence House confirmed the Accession Council will be broadcast on television at 10am on Saturday.
A newsreader of BBC One has said the Accession Council will be broadcast live by the BBC.
The procedure had always taken place behind closed doors until now.
Buckingham Palace confirmed earlier that the Accession Council will take place in the state apartments of St James’ Palace.
Following the accession, the Principle Proclamation will be read for the first time in public at 11am from the balcony overlooking Friary Court at St James’ Palace in central London.
This will be followed by multiple Proclamations across the country, with the second one at the City of London at the Royal Exchange at 12pm on Saturday.
More will follow in Scotland, Northern Ireland and Wales at 12pm on Sunday.
A statement from the Palace said: “The Proclamation will be read by Garter King of Arms, accompanied by the Earl Marshal, other Officers of Arms and the Serjeants at Arms.
“This is the first public reading of the Proclamation.”
The formal declaration is the formal method of sharing the news that the monarch has died and that the heir has acceded to the throne.
Historically, the Privy Council is summoned to oversee the formal proclamation of a new monarch.
But with now more than 700 privy counsellors, restrictions have been put in place for only 200 to attend.
The Queen Consort Camilla and the Prince William will be present as privy counsellors.
In recognition of the new title of King Charles III, flags will be flown at full-mast from the time of the proclamation at St James’ Palace until one hour after the proclamation.
The flags will return to half-mast afterwards to mark the mourning for the death of the Queen.
King Charles takes over the throne after his mother’s longest reign in British history.
The Queen died at 96 at her holiday home in Balmoral, putting an end to her 70-year-long reign.