William and Kate missed the Royal Victorian Order reception at Windsor Castle.
Those who possess the Royal Victorian Order honor are invited to the occasion, which takes place every four years.
Charles, Anne, and many royals were in attendance.
Kate launched a business task force focused on early childhood at the same time.
William hosted a meeting for his role as President of the Earthshot Prize.
William made a surprise visit to British troops in Poland.
The Royal Victorian Order honors service to the Sovereign and Royal Family.
Kate recently launched her Shaping Us project, which is her "life's work."
William and Kate are members of the Royal Victorian Order.