Catherine, Princess of Wales joined senior members of the royal family at the Festival of Remembrance on Saturday (0911.24). The 42-year-old princess – who underwent abdominal surgery and preventative chemotherapy treatment earlier this year – joined King Charles and other royals at the event at the Royal Albert Hall in London. The princess – who has Prince George, 11, Princess Charlotte, nine, and Prince Louis, six, with her husband, Prince William – has slowly been returning to public duties over recent weeks, after focusing on her health issues earlier in the year. The Festival of Remembran…