Much has been made of the clash between King Charles' Coronation and his grandson Prince Archie's fourth birthday on May 6, with many questioning whether it would have any baring on the Duke and Duchess of Sussex's attendance at the service. While it has since been confirmed that Prince Harry will travel back to Britain on his own for the ceremony, some have wondered how Meghan Markle will mark her son's special day back home in California. As so little is publicly known about Prince Archie and Princess Lilibet, well-wishers can only guess how they will celebrate the day based on details previously revealed in the couple's self-titled Netflix documentary series.