Boris Johnson urges people to 'wear a hat' on the big day, Will and Kate agree to share home with Harry
GIANT screens showing the Royal Wedding are to go up in Hyde Park and Trafalgar Square, as well as at the tented Will and Kate carnival on Clapham Common .
"The royal wedding will be a truly momentous occasion and we want everyone to be able to join in the celebrations," said Boris Johnson, announcing the two new venues for the 29 April event.
"This is a fantastic opportunity for London to show the world how we relish our traditions and that we know how to throw a party."
One way Johnson wants people to "show the world" is by wearing commemorative headgear.
"Get in the wedding mood and wear a hat," a spokesperson for the London Mayor advised people planning to attend the celebrations.
As well as a big screen, Hyde Park is to feature a big wheel and both venues will have plenty of side attractions and food stalls.
Meanwhile, it has emerged that Kate Middleton is to get two princes for the price of one as after the wedding, she will live at Clarence House with both new husband Prince William and his brother Prince Harry.
"She gets on brilliantly with Harry so it shouldn't be too much of a hardship," a royal source told The Telegraph.