About 100 noisy but peaceful protesters were contained by police outside the venue some 90 minutes before the official start of the ceremony, attended by Britain's Prince Charles, his wife Camilla, the Duchess of Cornwall, and Australian Prime Minister Malcolm Turnbull.
The protesters, carrying signs that read "colonisation is not a game", had earlier disrupted a leg of the Queen's Baton Relay and demanded Britain's royal family members ask them for permission to visit "stolen" land.