Britain's Queen Elizabeth will host a street party for 10,000 people.
The 89-year-old royal is set to celebrate her 90th birthday this year and will welcome the thousands of guests to The Mall near Buckingham Palace, London for The Patron's Lunch.
Peter Phillips, who is organising the event and also happens to be the Queen's grandson, told the Daily Mail newspaper: "I was very conscious to make sure we did this properly, so we went through the normal channels of approaching the Palace.
"We had to show that this wasn't a case of trying to cut corners because the Queen happens to be my grandmother. I said [to the Queen], 'Oh, by the way you may or may not have heard that we are having conversations with your office about this' ... She said, 'I've heard you're up to something.'"
The Mall is set to be filled with a thousand tables, which seats ten people each, whilst ten thousand chairs will have to be placed down the iconic road individually.
Guests - which will include charities and their guests as well as some lucky members of the public - will dine on refreshments from Marks & Spencer, Pimm's, PG Tips and Wall's whilst they watch on as the Queen and the Duke of Edinburgh arrive in their Range Rover.
Organisers have promised a "carnival" style atmosphere, with lots of performances spreading out across the Mall and into the nearby Royal Parks.