Thousands of tourists and royal fans are expected to flock to see the Duke and Duchess of Cambridge join the Queen for a carriage procession to mark the end of the Diamond Jubilee celebrations.
In their first formal carriage ride since they were married, Kate and William will join the Queen and Duke of Edinburgh in a procession through the streets of Westminster via Parliament Square, Whitehall, Horse Guards and The Mall to Buckingham Palace.
The much-anticipated journey will take place on 5 June, and is expected to draw huge crowds. And, in another similarity with last year's royal wedding, family members will end the procession by congregating on the balcony at Buckingham Palace - this time to watch an RAF flypast.
While Kate and William will wave to fans from their carriage, the Queen and Philip will travel in the same 1902 state landau that William and Kate used as they left Westminster Abbey after their nuptials.
When the Queen's carriage reaches Buckingham Palace, soldiers and officers from the 1st Battalion Irish Guards will be providing a guard of honour in the forecourt.
The Prince of Wales, Duchess of Cornwall, Prince Harry and a host of other royals will be joined by a Sovereign's Escort provided by the Household Cavalry Mounted Regiment in their breastplates and plumed helmets.
According to the Daily Mail, many will be from across the country, whose trade, craft or profession are represented by livery companies from the City.
Charities, schools and other organisations supported by the companies will also be invited.
The events will be the culmination of the four-day bank holiday weekend which will see the Queen's 60-year reign marked with a Thames Diamond Jubilee Pageant on June 3, followed the next day by a concert in front of Buckingham Palace which will feature acts including Stevie Wonder, JLS and Jessie J, all brought together by Gary Barlow.
Lieutenant Colonel Dan Hughes, the Household Cavalry's commanding officer, told theDaily Telegraphthat being involved with the Diamond Jubilee procession was a"huge privilege" and said: "During the royal wedding last year, the size of crowds took us all by surprise. We're expecting something similar for the Jubilee."
Elbows at the ready, then...
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