Here's a schedule I found online too that details what time everything is happening:
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Between 3:15 am and 4:45 am EST, 12:15 am and 1:45 am PST: The general congregation will arrive at the Great North Door of Westminster Abbey.
From 3:50 am EST, 12:50 am PST: Governors-General and Prime Ministers of Realm Countries,the Diplomatic Corps, and other distinguished guests arrive at the Abbey. Victoria Beckham is among the wedding's high-profile guests, but it's unclear if she is considered "distinguished."
5:10 am EST, 2:10 am PST: Prince William and Prince Harry leave Clarence House for Westminster Abbey. They arrive at the Abbey at 5:15 am EST, 2:15 am PST.
5:20 am EST, 2:20 am PST: Members of foreign royal familiesincluding Crown Princess Victoria of Sweden and Prince Seeiso Bereng Seeiso of Lesothoarrive at Westminster Abbey.
5:20 am EST, 2:20 am PST: Kate's mother Carole Middleton and her brother James leave the Goring Hotel. They arrive at the Abbey at precisely 5:27 am EST, 2:27 am PST.
5:25 am EST, 2:25 am PST: Lesser known members of the royal family, including Lady Amelia Windsor (29th in line to the throne) depart for the Abbey. They arrive at 5:30 am EST, 2:30 am PST.
5:35 am EST, 2:35 am PST: The members of the royal family who you might actually recognize depart. They arrive at the Abbey at 5:40 am EST, 2:40 am PST, and include Princess Anne, Prince Andrew, Princess Eugenie, Princess Beatrice, and Prince Edward.
5:38 am EST, 2:38 am PST: The Prince of Wales and The Duchess of Cornwall leave Clarence House. They arrive at the Abbey at 5:42 am EST, 2:42 am PST, assuming they avoid a repeat of the riot mob attack on their Rolls Royce that slowed them down last December.
5:40 am EST, 2:40 am PST: The Queen and The Duke of Edinburgh leave Buckingham Palace for Westminster Abbey. They arrive at 5:45 am EST, 2:45 am PST.
5:48 am EST, 2:48 am PST: The bridesmaids and pages leave the Goring Hotel for Westminster Abbey. They arrive at 5:55 am EST, 2:55 am PST.
5:51 am EST, 2:51 am PST: Kate Middleton and her father Michael leave the Goring Hotel for Westminster Abbey.
6:00 am EST, 3:00 am PST: The service begins.
7:15 am EST, 4:15 am PST: The Carriage Procession of the Bride and Bridegroom with a Captain's Escort of the Household Cavalry, followed by The Queen's Procession with a Sovereign's Escort of the Household Cavalry, leaves Westminster Abbey for Buckingham Palace.
7:30 am EST, 4:30 am PST: Kate and William arrive at Buckingham Palace.
7:40 am EST, 4:40 am PST: Members of the royal family and members of foreign royal families arrive at Buckingham Palace.
From 7:40 am EST, 4:40 am PST: Other guests for the reception arrive at Buckingham Palace.
8:25 am EST, 5:25 am PST: Kate and William, and their families, appear on the balcony. The bride and groom stage their much-anticipated kiss.
8:30 am EST, 5:30 am PST: The Royal Air Force and the Battle of Britain Memorial Flight fly by.
