The musical event is one of the most important dates in the royal calendar, with the more solemn ceremony planned for Sunday at the Cenotaph, a war memorial. Both events honor fallen British soldiers.
Kate and William were joined in the royal box by King Charles III, who is still undergoing treatment for his own cancer.
Under chemotherapy for several months
In February, Buckingham Palace announced that Charles, 75, was suffering from cancer, without specifying the nature, and that he was withdrawing from public life to undergo treatment.
The following month, Kate, 42, revealed that she too had cancer and was undergoing chemotherapy.
Both have since made a limited return to public life. Charles recently took a brief break from treatment for a trip to Australia and Samoa.
Kate announced in September that she had finished chemotherapy and was looking forward to taking on more commitments.
“It was awful”
Last month, she and the heir to the throne visited Southport, in northwest England, to meet residents affected by a knife attack that left three girls dead in July.
Kate is expected to attend the wreath-laying ceremony at the Cenotaph near Parliament in London on Sunday, along with other members of the royal family, political leaders and current and former members of the armed forces, including war veterans.
This will be the first time she has participated in official engagements for two consecutive days since the start of the year.
William said this week that the past year has been “brutal” and probably the “hardest” of his life, due to two cancer diagnoses.
“Honestly, it’s been awful,” he told reporters Thursday, at the end of a trip to South Africa.
Queen Camilla, Charles’s wife, missed Saturday’s concert and is also expected to be absent on Sunday because of a lung infection, the royal palace said.
