LONDON — Texan Christine Deaver and her mother finalized their trip to watch the royal wedding the morning Prince Harry and Meghan Markle announced when it would happen.

Christine Deaver shows off her nails encrusted with crowns. Susannah Ireland / for NBC News

"By 10 a.m. ... we had everything booked: Train, plane, hotel," said the 27-year-old, who lives in Hurst in the Dallas-Forth Worth area. "Then all we had to do was wait. The hardest part.”

That wait is almost over.

On Thursday, the self-described royal superfan and her mother Marie Evans stood in front of London's Buckingham Palace all set to travel to Windsor, where the wedding will be held on Saturday.

“When you have a hobby like knitting you often have something to show for it. With royals you get to go to the events,” said Deaver, 27, who runs the Royal Tiara blog, which focuses on the history of such headgear. “Going to the wedding makes it real so it’s not just me sitting on my computer looking at pictures.”

Deaver and Evans, 59, aren't the only Americans to descend on Britain for Harry and Markle's big day.

A total of around d 100,000 visitors are expected to be in Windsor — which usually has a population of around 31,000 — to celebrate and hopefully catch a glimpse of the couple. There are typically 88,000 Americans in the U.K. on any given May day, according to national tourism agency Visit Britain. Many of these will likely head to Windsor this weekend.

Deaver carefully planned out how she and her mother will spend Saturday. First, they'll catch a train no later than 6 a.m. to Windsor, which is some 25 miles west of London. Then they’ll look for a big screen in a park to watch the ceremony. Next they'll try and secure a good spot along the route where Harry and Markle will take a post-wedding carriage ride.

During the rest of their week-long trip, Deaver and Evans will stop at other royal hot spots like Kensington Palace, where Princes Harry and William live, the Tower of London to see the Crown Jewels, and the hospital where Kate, the Duchess of Cambridge, recently delivered Prince Louis.

Mother and daughter are also stocking up on royal memorabilia.

“I’ve got my eye on tea towels, mugs, Christmas ornaments, and coloring books. I’m sure there will be lots of ridiculous things,” said Deaver who had never heard of Markle until the former "Suits" star began dating Harry. Since then she's binge-watched the legal drama through its seventh season.