Transcript for 'We are on the list,' says community worker invited to the royal wedding: Part 6

Reporter: Serena Williams, George Clooney, sir Elton John, David and Victoria Beckham, a few of the cast members from "Suits" and most of the spice girls. What do they all have in common? They're just some of the stars expected for tomorrow's big event. It is a big deal to be invited to the royal wedding. Reporter: A big deal by royal standards, tomorrow's wedding will be an intimate affair. He's not having an official state wedding in London. He's having a family affair in Windsor. Reporter: Diana and Charles hosted 3,500 guests at St. Paul's cathedral. William and Kate welcomed nearly 2,000 well-wishers to Westminster abbey. Prince Harry and his bride will host just 600 friends and family inside cozy St. George's chapel, located on the sprawling grounds of Windsor castle. It's somewhere he loved as he grew up, often visiting Windsor with his family. Reporter: It's where prince Harry was christened 33 years ago. Granny was christened in this. So was I. Reporter: Seen here in the arms of his mother at just three months old. We're just going to be there and say "Oh hello, can we come in? We're on the list." Reporter: They're on the list, sitting outside the chapel but just inside the castle walls -- They'll be able to have a birds eye view of the arrival of Harry and William, and then Meghan and all those little bride's maids and pageboys. Reporter: Following protocol, the queen will be the last member of the royal family to arrive for the wedding service which starts promptly at high noon. That's 7:00am on the east coast and 4:00 A.M. On the west coast of the U.S. Because the wedding is in Windsor, over an hour's drive from Buckingham palace. Here's what you won't see, the familiar balcony gathering that other royal couple has shared. But after the I do's the couple will follow an unbroken tradition for centuries. The last time fun cousin Harry made the journey, he was riding with the little ones. Tomorrow, it will be prince Harry's turn to present his bride. This 100-year-old horse drawn carriage will depart at 1:00 P.M. Local time. People from around the world have camped out in the town of Windsor for days. Michelle from Melbourne, Australia. Donna Warner from new Fairfield, Connecticut. I'm faith and I've come all the way from London. Reporter: Earlier today, prince Harry and brother William came out of the castle to meet the adoring crowd. An even more exclusive party will happen after dark, thrown by prince Charles at the royal's 17th century country estate, frogmore house. I think you're even more privileged if you make the cut to the second party, which has only got 200 people. Allegedly pippa Middleton has not made the cut. So you have a lot of competition going on with that invite. Reporter: Royal, celebrity, or member of the public, everyone loves a wedding. It's just so special and just gives you goosebumps. They're going to make a wonderful couple and wonderful ambassadors to both of our

This transcript has been automatically generated and may not be 100% accurate.