Also known as the King’s Birthday Parade, the Trooping the Colour is a traditional show of military pomp and pageantry that dates back to the 17th century and features 1,400 troops on horseback and on foot, including 400 army musicians.

The soldiers would be “reviewed by her royal highness the Princess of Wales,” the listing said, advertising tickets for between 5 pounds ($6.36) and 15 pounds ($19.09). King Charles III is due to review troops in an almost identical event the following weekend June 15.

“The soldiers will be inspected by Her Royal Highness The Princess of Wales, Colonel Irish Guards,” the event listing said, referring to her honorary military title, previously held by William.

The listing now simply refers to the event as “The Colonel’s Review,” with no mention of Kate by name or any explicit confirmation that she will be there.

The princess was pictured this week in a black SUV driven by her mother near Windsor Castle.

The king, 75, was diagnosed with cancer following a medical procedure in February, but he has continued with royal duties behind the scenes while skipping some in-person appearances.