King Charles III, a military parade that will be the Princess of Wales ' first public appearance since her cancer diagnosis early this year.
The annual event is also a show of stability by the monarchy after months in which both the king and Kate, wife of heir to the throne Prince William, have been sidelined by cancer treatment.
Kate announced Friday that she would attend the King's Birthday Parade after making progress in her treatment. She disclosed in March that she was undergoing chemotherapy for an unspecified form of cancer.
«I am making good progress, but as anyone going through chemotherapy will know, there are good days and bad days,» Kate said in a statement, adding that she faces «a few more months» of treatment.
The 42-year-old princess is expected to travel by horse-drawn carriage from Buckingham Palace with her children George, 10, Charlotte, 9, and 6-year-old Louis. She will watch the ceremony from a building overlooking Horse Guards Parade, a ceremonial parade ground in central London.
Prince William will be on horseback for the ceremony, also known as Trooping the Color, in which troops in full dress uniform parade past the king with their regimental flag, or «color.» Charles, who also is being treated for an undisclosed form of cancer, is due to inspect the troops alongside Queen Camilla from a carriage.
Charles, 75, disclosed his cancer in February, and has recently eased back into public duties. He attended commemorations last week