Catherine, Princess of Wales, announced on Friday she will make her first public appearance in six months this weekend after "making good progress" in treatment for cancer. But on the good days, when you feel stronger, you want to make the most of feeling well." Her appearance at Saturday's annual Trooping the Colour parade for Charles's official birthday will be her first public appearance since she was seen gathering with other royals for Christmas last December. However, he will participate in this year's birthday parade from a carriage, rather than on horseback as he did at his inaugural parade as king last year. The yearly event marks the sovereign's official birthday and is one of the highlights of the royal calendar.