Prince William and Kate Middleton missed a royal reception at Windsor Castle for the Royal Victorian Order.
The event is held once every four years and attended by those who hold the Royal Victorian Order honor.
King Charles III, Princess Anne, and the Duke and Duchess of Edinburgh were in attendance.
The Prince and Princess of Wales were not present despite being members of the Royal Victorian Order.
Kate launched a business task force focused on early childhood in London at the same time as the event.
William hosted a meeting for his role as President of the Earthshot Prize.
William later made a surprise visit to Poland to meet British troops near the border of Ukraine.
The Royal Victorian Order honors service to the Sovereign and the Royal Family.
Kate recently launched her Shaping Us project, which she described as her "life's work".