The King and Princess attended the same event, but separately. Sources close to the royal family worry that the media covered Kate's visit extensively and did not pay enough attention to Charles.
Prince Harry claimed that Charles and Camilla didn't like William and Kate drawing attention to them. The Duke of Sussex wrote in his autobiography: "Camilla and Charles don't like it for their own reasons, they have openly reprimanded William for it many times" It's a shame that his visit with the Queen received less coverage than he expected. I hope he wasn't too disappointed.