Campaigners have added their voice to demands for the release of letters between the Australian Governor General and the Queen, dating back to 1975.
Campaign group Republic is to hold its Annual Convention in Newcastle on Saturday July 15.
Speakers include local MP Chi Onwurah, new Kensington MP Emma Dent Coad, former Greens leader Natalie Bennett, Newcastle academic Martin Farr and Swedish MP Christina Örnebjär.
The Sovereign Grant should be scrapped and royal funding radically overhauled, according to campaigners.
Responding to the news of another massive increase in royal funding, campaign group Republic has called on the government to intervene.
Ahead of the release of the Royal Household's annual finance report, campaigners have said the true cost of the monarchy is over £345m a year.
That's the equivalent to the cost of hiring 17,000 new police officers or 15,500 new firefighters.
Campaigners have today said reluctant royals should stand aside and make way for an effective head of state.
The comments come after an interview in which Prince Harry claimed no royal wants to be king.
Since the weekend 5000 people have joined calls for a new oath for MPs.
MPs have started to take their oaths today, pledging allegiance to the Queen.
The Queen is unable to perform an effective, independent role as head of state during the current political crisis, campaigners have warned.
Campaigners have renewed calls for a full inquiry into lobbying and political interference by members of the royal family.
The call follows fresh revelations about Prince Charles and Prince William over the past 24 hours.
Royal archives should be opened up to reveal millions of official secrets, according to a new campaign to be launched this weekend.
Like what Republic does?
Unlike the royals, Republic can't guarantee its funding - we rely entirely on the support of people like you, people who care about Britain's democracy.
If everyone who reads our updates and follows our campaigns became a member or supported us with a donation – we'd be well on the way to achieving a democratic alternative to the monarchy.
Don't want to join or donate at this moment in time? No worries! You can sign up for free email updates to keep up to date with all our latest campaigns and events.