The British royal family is planning to celebrate the centenary of Queen Elizabeth's birth on April 21. King Charles, Queen Camilla, and other members of the royal family will attend events including a party with cake. The events will include a visit to the new Royal Collection Trust exhibit, "The Queen Elizabeth Memorial," which is the largest-ever exhibit of the late Queen's fashion. The Queen Elizabeth died at age 96 in 2022, making her the longest-serving sovereign in British history. The reception will include representatives from several of the Queen's hundreds of patronages and special guests.