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The Queen celebrates two birthdays - her actual birthday in April and her official birthday in June |
Tickets for a street party to mark the Queen's 90th birthday in London's The Mall will cost £150 each, her grandson has announced.
Peter Phillips said the Patron's Lunch on 12 June was a not-for-profit event and would have a "carnival atmosphere".
Most of the 10,000 guests will be from organisations associated with the Queen, with 1,000 tickets to be released in a public ballot next month.
The party will be the culmination of a weekend of national celebrations.
The Queen celebrates two birthdays each year: her actual birthday on 21 April and her official birthday on a Saturday in June.
'Up to something'
The Patron's Lunch will honour the Queen's lifetime dedication to service and mark her patronage of more than 600 charities and organisations.
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The street party at The Mall will take place in June |
Mr Phillips, who is helping to organise the event in his role as director of Sports and Entertainment Ltd (SEL), said the Queen had heard about his plans before he had a chance to tell her.
He recalled that upon approaching her with the idea she said: "I've heard you're up to something."
He added: "There's a huge amount of pride, the fact that I'm able to celebrate, to put something on, to put a celebration on which ultimately she appreciates, she enjoys and she thinks is a great idea."
Mr Phillips said the party's guests would be given hampers of food at tables set up along The Mall.
The event will also feature a carnival parade before and the Queen and Duke of Edinburgh take to a stage to listen to speeches marking the occasion.
The majority of the tickets for the event, which is also being attended by Prince William and Prince Harry, have been allocated to the hundreds of organisations and charities associated with the Queen.
In February a ballot will open to the public for a minimum of 1,000 tickets, with winners able to buy them from the event's website.
Remarking on the cost of the tickets, Mr Phillips said the event's corporate partners had "provided the funding for the majority of the costs".
He said: "This is a not-for-profit event. SEL is being paid a set fee basically to take this from sign-off from the palace through to delivery of the event."
A spokeswoman for the Patron's Lunch said support from the event's partners did not cover its costs fully and tickets offered "genuine value".
The organisers also hope communities around the country will be inspired to stage Patron's Lunches in their own areas and raise money for local projects.
Other events taking place over the Queen's official birthday weekend will include a service of thanksgiving at St Paul's Cathedral and the traditional Trooping the Colour ceremony, also known as the Queen's Birthday Parade, at Horse Guards Parade.
Any surplus money from the Patron's Lunch will be allocated to a newly created Patron's Fund, which will be used to support specific initiatives and projects run by the Queen's charities.
With BBC News