The guests adhered to the warning, Alexi Lubomirski recalled.Prince Harry and Meghan Markle on their May 19, 2018 wedding day.Credit: GettyThe GistPrince Harry and Meghan Markle married eight years ago on May 19, 2018 in a ceremony at St. George’s Chapel on the grounds of Windsor Castle.The Duke and Duchess of Sussex’s photographer, Alexi Lubomirski, later said that wedding guests were given a specific instruction by the palace as they arrived a…