Normally the Queen and other senior royals watch the Trooping the Colour parade, a ceremony that has been taking place for more than 260 years.
This takes place on Horse Guard’s Parade off Whitehall, and is followed by an RAF fly pass over Buckingham Palace.
However this year the monarch will remain in Windsor Castle, where she has been staying for the past few months of the COVID-19 pandemic.
A parade will still go ahead, but will instead take place in the Quadrangle of Windsor Castle.
Soldiers from the 1st Battalion Welsh Guards, who are currently on duty at the castle, will perform the service.
As the event is taking place inside Windsor Castle no public viewing will be available.
Consequently the Queen is requesting members of the public do not congregate in Windsor in the hope of seeing some of the action, it has been reported.
Large groupings, which aren’t socially distanced, are currently banned under the Government’s coronavirus legislation.
The ceremony will start with the Queen arriving in the Quadrangle which will be marked by a royal salute.
The Welsh Guards will then perform a series of intricate military drills, before a second royal salute and the Queen’s departure.
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However more recently the monarch, who is now 94, has attended in a royal carriage.
The Trooping the Colour parade typically involves around 1,400 parading soldiers, 400 musicians and 200 horses though this may be reduced this year.
In regular years enthusiastic crowds, many waving union jack flags, would crowd along The Mall to catch glimpses of the parade.
Describing a typical year the official Royal family website says: “After the military bands have performed, the escorted Regimental Colour, or flag, is processed down the ranks of soldiers.
“Over one hundred words of command are used by the Officer in Command of the Parade to direct the several hundred soldiers.
“Once the Foot Guards have marched past The Queen, she rides back to Buckingham Palace at the head of the soldiers, before taking the salute again at the Palace from a dais.
“Her Majesty is then joined by other Members of the Royal Family on the balcony at Buckingham Palace to watch a fly-past by the Royal Air Force.
“A 41-gun salute is also fired in Green Park to mark the occasion.”
Prince Charles is currently self-isolating in Scotland after having caught, and recovered from, COVID-19 earlier in the outbreak.
In April the Queen delivered a special televised message to the about the deadly epidemic.
Echoing a WWII era song she said: “We will be with our friends again; we will be with our families again; we will meet again.”