The annual Trooping the Colour event is a grand military parade to celebrate the monarch's birthday, held in June regardless of the actual birth date. With King Charles and Kate Middleton battling cancer, this year's event holds special significance. Over 1,400 officers, 200 horses, and 400 musicians will participate, following a route from Buckingham Palace to Horse Guards Parade. The ceremony includes a royal salute, gun salute, troop inspection, and musical performances. King Charles will ride in a carriage with Queen Camilla due to his health, then watch a fly-past with the royal family from Buckingham Palace. The event will be broadcast live on BBC, featuring King Charles, Queen Camilla, Prince William, and Middleton, along with other royals. Notably, Prince Harry and Meghan Markle will not attend, continuing their rift with the royal family since moving to the US.