Have fun at William's wedding, Cameron tells Britons
A sign stands outside a pub promoting Royal Wedding events, in central London.
"Don't interfere, don't get in the way and don't make problems where there are none. Let people get on and have fun," Cameron wrote Monday in a special column for The Sun.
"And my message to everyone who wants to have a street party is - I'm having one and I want you to go ahead and have one too."
"The truth is that this is a great chance for communities to come together and celebrate. Let's make this a day to remember. For everyone," the prime minister wrote.
William weds Kate Middleton at the Westminster Abbey on April 29.
Cameron will stage a bash at Downing Street with wife Samantha to help put the country in a party mood.