text:  The Princess of Wales was on hand watching from the Royal Box. This was Kate's second public appearance this year while she undergoes treatment for cancer. I'm Nora Rahm, NPR News. Support for NPR comes from NPR stations. Other contributors include BetterHelp, committed to supporting mental health through therapy. Clients are matched with one of 35,000 therapists and can communicate via video, chat, or phone at betterhelp.com slash public.