(CNN) — Britain’s Prince Harry and Meghan Markle announced their engagement in November last year, sparking months of speculation about the details of their upcoming wedding.

Rumors about the dress, the performers and the all-important guest list continue to swirl. Here’s what we know so far and what’s still under wraps.

The venue

Prince Harry and Meghan Markle will marry on Saturday, May 19, in St. George’s Chapel in the grounds of Windsor Castle, about 20 miles (32 kilometers) west of central London.

Windsor is the oldest and largest inhabited castle in the world and an official residence of Queen Elizabeth II, who spends most of her weekends there.

The chapel has a capacity of around 800.

London florist Philippa Craddock has been tasked with decorating the chapel. Her team plans to use white garden roses, peonies and foxgloves, as well as branches of beech, birch and hornbeam for the floral displays, which will be distributed to local charities after the wedding.

Many of the plants will be sourced from the gardens and parkland of the royally owned Crown Estate and Windsor Great Park, according to Kensington Palace.

The schedule

The couple will exchange vows at noon (7 a.m. EDT).

At 1 p.m. (8 a.m. EDT), the newlyweds will leave Windsor Castle in a carriage for a roughly two-mile procession, traveling along the High Street through the town of Windsor, before returning to the castle by the Long Walk, according to the Palace.

The couple and guests will then attend a reception hosted by Queen Elizabeth II at St. George’s Hall in the castle grounds, prior to a smaller evening reception for around 200 friends and family hosted by Prince Charles, Harry’s father.

The ceremony

The Dean of Windsor, the Rt. Rev. David Conner, and the Archbishop of Canterbury, Justin Welby, the leader of the Church of England, will officiate the ceremony.

Markle is now a fully fledged member of the Church of England after she was reportedly baptized and confirmed by Welby in a secret ceremony in March.

It’s been widely assumed Prince William will step into the role of best man. But in January, the Duke of Cambridge spoke of the upcoming nuptials and joked that his brother had not asked him yet.

More than 250 members of the British Armed Forces will also be involved on the day, an acknowledgment of Harry’s time in the army. Personnel from a number of units including the Royal Marines and the Windsor Castle Guard will line the local streets, with music provided by the Band of the Irish Guards.

The guest list

More than 2,600 people will receive a personal invitation inside the grounds of Windsor Castle on the big day. The invitees — including 100 local schoolchildren and 610 Windsor Castle community members — will be able to watch the arrivals of the bride and groom and their guests and to watch the newlyweds depart the castle on their carriage procession.

Official invitations to the ceremony and the lunchtime reception have been sent, but the guest list remains a secret.

The invitations were made by Barnard & Westwood, a London printer and bookbinder that has been making invitations for the royal family since the 1980s, according to Kensington Palace.

The security operation

Thames Valley Police, the force that operates in the borough of Windsor and Maidenhead, has overall command of the policing for the wedding and is supported by partner agencies including the Metropolitan Police and the British Transport Police, according to a spokesman for Thames Valley Police. The operation is one of the largest ever undertaken by the force.

According to a police statement, security in the area has already been stepped up, with armed and unarmed officers as well as search dogs and mounted police patrolling the streets of Windsor in the weeks leading up to May 19.

Police have warned that people traveling to the area by car on the day may be stopped by police, while British Transport Police will be patrolling train stations and carriages. Anyone arriving in Windsor by train will be screened and searched.

There are no details yet on the cost of security for the wedding or the number of officers involved.

The menu

Guests will enjoy a non-traditional wedding cake made by pastry chef Claire Ptak. The lemon elderflower cake will feature buttercream and fresh flowers as decoration.

Ptak, who was raised in California and now owns London-based bakery Violet Cakes, was previously acquainted with Markle, who had featured the chef on her former lifestyle blog.

Further details of the food and drink being offered have not been released.

The entertainment

Despite rumors that the Spice Girls, Elton John, Ed Sheeran or Sam Smith could be performing at the second, evening reception, nothing has yet been confirmed by Kensington Palace.

The honeymoon

While the wedding itself will be a public affair, the choice of honeymoon destination is a closely-guarded secret.

There’s already a long list of locations being suggested as possible destinations, including Botswana (where the pair vacationed early in their relationship) and the Seychelles (where William and Catherine spent their first days as a newly-married couple).

(The-CNN-Wire ™ & © 2018 Cable News Network, Inc., a Time Warner Company. All rights reserved.)

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