The palace is the focus of festivities for much of the weekend.
On Saturday 1 June at 2000-2200 BST the Prom at the Palace took place.
The Queen and The Duke of Edinburgh and an audience of 12,000 watched a classical music concert performed in the gardens of the palace. Star attractions included soprano Dame Kiri Te Kanawa and baritone Sir Thomas Allen.
On Monday 3 June from 1930–2230 BST, there’s another party at the palace. This time the focus is pop music and it is the culmination of the BBC’s UK-wide Music live festival. The main attractions include Sir Elton John and Sir Paul McCartney.
Fireworks at the palace
Both events are ticket only with places given to members of the public who applied to a lottery earlier in the year. But those who don’t have tickets will be able to view both concerts on large screens in the nearby parks and along the Mall.
After Monday’s party the Queen will light a beacon in front of the palace and at 2245 BST fireworks will be launched from Buckingham palace roof and courtyard.
On Tuesday the Queen and Royal Family members will leave the palace at 2240 BST in a grand state procession to St Paul’s. Her departure will be accompanied by a full symphony orchestra and 800 choristers performing in front of the palace.
She will return at about 1540 BST to watch a carnival and parades taking place on the Mall. At 1740 BST the Queen and members of her family will make a special appearance on the palace balcony for the finale to the celebrations: a flypast of 26 RAF aircraft followed by the Red Arrows and Concorde.