Sloane Square, Duke of York Square and the King's Road host a tea party for the Queen's diamond jubilee. Some 300 seats are available at the 'Royal Table' (you can book in advance via www.dukeofyorksquare.com), with a view of the giant screen showing live footage of the river pageant. There's also a military band, and a chance to dress up and have your photo taken with the Queen, well a look-alike, at least.
perks!