More than 10,000 people including a cast of 6,000 performers are set to be involved in a colourful pageant through the streets of London that will mark the end of the Platinum Jubilee celebrations. The 3km carnival procession from Horse Guards, along Whitehall to Admiralty Arch and down The Mall to Buckingham Palace.
It's set to be a busy final day of jubilee celebrations with plenty going on throughout the day. We've taken a look at all of the timings for the big events, and you can follow live updates here.
It comes after another packed day on Saturday that saw the Duke and Duchess of Cambridge, alongside Prince George and Princess Charlotte, visit Cardiff Castle before a huge concert watched by millions outside Buckingham Palace.
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The pageant that will tell the story of the Queen's reign through four different acts will start at 2.30pm.
The event will be broadcast live on BBC One from 1pm , and is due to be shown on large screens around The Mall in London, Edinburgh’s Princes Street Gardens and in Bute Park in Cardiff, where a Big Jubilee Picnic is due to take place between noon and 5pm.
Hundreds of people are expected to visit similar events are set to take place all around the country including at Pembrey Country Park, Newport's Beechwood Park, Oystermouth Castle in Swansea and Welshpool's Maes-y-dre recreation ground.
It comes at the same time millions will gather for patriotic street parties, picnics and barbecues, with more than 85,000 Big Jubilee Lunches being held across the UK. Take a look at the weather forecast for this afternoon here.
The ambitious £15 million pageant in London is split into four acts: For Queen and Country with a military parade; The Time of Our Lives progressing through seven decades of culture, music and fashion; Let's Celebrate telling the story of the Queen's life in 12 chapters with corgi puppets and carnival creations; and the Happy and Glorious musical spectacle.
Celebrities will travel in decorated open top double decker buses for the decade-by-decade celebrations.
Among the sights will be the Gold State Coach which will feature archival footage of the Queen broadcast at the windows, making it seem as if the monarch is in the carriage.
A peloton of 300 cyclists, riding vintage bikes from across the seven decades of the Queen's reign, is to travel down The Mall led by Sir Chris Hoy and cycling golden couple Dame Laura and Sir Jason Kenny.
Close to 200 national treasures will take to the stage to serenade the Queen by singing the national anthem at the grand finale of the Platinum Jubilee festivities.
Stars including Sir David Jason, Harry Redknapp, Sir Cliff Richard, Sandie Shaw, Felicity Kendal, Joe Wicks and Holly Willoughby will join Ed Sheeran in a mass rendition of God Save The Queen outside Buckingham Palace at the end of the pageant.
It is hoped the monarch will make an appearance on the Buckingham Palace balcony to round off the weekend and see the celebrities singing the national anthem.
As long as the weather allows there will be another Red Arrows flypast over Buckingham Palace at 5.05pm, effectively marking the end of Jubilee celebrations.
