Prime Minister Justin Trudeau will join Gov. Gen. Mary Simon at Rideau Hall this morning as King Charles III is proclaimed Canada's new head of state at an accession ceremony.

Trudeau and members of the federal cabinet and Privy Council will meet prior to the ceremony as part of the protocol needed to formally proclaim the new sovereign.

The accession ceremony comes as the federal government prepares a series of events to commemorate the legacy of his mother, Queen Elizabeth II.

Officials are waiting for public confirmation of when her state funeral will be held in London before announcing the date of Canada's national commemoration ceremony for the Queen.

The Heritage Department says the national ceremony will start with a memorial parade composed of Canadian Armed Forces members and RCMP officers along with a 96-gun salute _ one for each year of her life _ and a CF-18 flypast.

That will be followed by a service at the Anglican Christ Church Cathedral in downtown Ottawa, which will be attended by government officials and other dignitaries and nationally televised for all Canadians.

Protocol calls for 10 days of mourning following the Queen's death, but the rules around the actual funeral are not as rigid.