Harry and Markle's wedding ceremony will begin at noon GMT, or 7 a.m. EST. David Conner, the dean of Windsor, will conduct the service, with Justin Welby, the archbishop of Canterbury, to officiate. Harry and Markle will take a carriage ride through Windsor after the ceremony. The procession, which begins at 8 a.m. ET, will take the couple through Windsor Town before returning to Windsor Castle along the Long Walk.