Republican protesters failed to dampen the party spirit as one million people lined the River Thames to mark Queen Elizabeth’s Jubilee pageant on Sunday.
The British monarch is the world’s second longest serving head of state, behind the King of Thailand, having come to the throne 60 years ago.
Graham Smith, the head of campaign group Republic, said the unelected Royal Family has no place in 21st century Britain.
“People don’t need that kind of icon, you know, much better icons are, you know, ideas like democracy and the equality of citizenship, and maybe someone chosen by us to represent us,” he said.
But a recent poll showed 80 percent of Britons want the country to remain a monarchy.
Republic, which says it has more than 20,000 members, is planning more protests over the next two days of celebrations.