King Charles and Queen Camilla will attend the Royal Maundy Service at St Asaph Cathedral, on Thursday 2 April.
It will be the first time the occasion has been held in North Wales, and only the second time ever in Wales, in its 800-year history.
During the service, the King will present the Royal Maundy gifts to approximately 77 men and 77 women mainly from Wales but also from dioceses across the UK.Maundy Thursday is the Christian holy day falling on the Thursday before Easter.
Meanwhile, anti-monarchy group, Republic, has announced a protest demonstration against King Charles over Andrew Mountbatten-Windsor's links to the late US sex offender, Jeffrey Epstein.
In an announcement made on its social media accounts the group said, "Republic will be protesting the Royal Maundy service in St Asaph THIS THURSDAY."
"We'll be asking Charles 'What did you know?' about the Andrew scandal. Join our demo, pledge to protest with us in Wales."
King Charles stripped his brother, Andrew Mountbatten, of his royal titles in last year over his links with Epstein.