From Los Angeles to Lesotho, the world is readying to celebrate the Royal wedding on Saturday.
Here is a summary of some of the festivities.
Russia
In Russia, where the Kremlin has been encouraging a return to traditional values and religiosity, the top-selling newspaper ran an article focusing on Ms Markle's age ahead of the royal wedding.
“'Even if you are over 30, there is still hope to marry a prince …' There is now evidence to back up this 'hymn' of lonely women,” wrote Komsomolskaya Pravda.
“Few thought that this 36-year-old American would be accepted into the royal family! But love overcame age and convention,” it said before recounting the story of how the pair met.
Odnoklassniki, one of Russia's largest social networks, said on Friday it would broadcast a livestream of the wedding.
The Russian version of the free newspaper Metro, which is handed out in the Moscow underground, suggested a drinking game that wouldn't leave readers “indifferent” while watching the nuptials.
Participants should take a sip of “something strong” every time they hear a reference to Prince Harry's cousin Beatrice, Wallis Simpson, or Grace Kelly, the American actress who married the Prince of Monaco.
After they hear five such references, they should down their drink, it said.
Kenya
A hotel in Nairobi is charging £7,000 to watch the Royal Wedding on television.
The Windsor Golf Hotel & Country Club is selling couples-only tickets at a price equivalent to what the average Kenyan earns in nearly seven years. The six-hour event includes “an English brunch by a seasoned English chef”, champagne toasts to the royal couple and a fashion show.
India
Ipsos Mori poll says Indians care more about the royal wedding than any other nationality - but our correspondent says you wouldn't know it in Delhi, other than adverts for the usual TV coverage.
Netherlands
In the Netherlands - where royalty is very much loved and there's a popular television programme tracking what different royals are up to - Dutch schools have been teaching lessons on the British royal wedding.
United States
LA: British pubs across the city are advertising their “slumber parties” for the 4am local time ceremony, with the Cat and Fiddle in Hollywood suggesting revellers come in their pyjamas and fascinators – described helpfully by the LA Times as “the precarious and ostentatious ladies' headgear constructed for such special events.”
The British Consulate will host 150 for afternoon tea. Girls studying at Ms Markle's former school - the Immaculate Heart, in Hollywood - will gather to watch the events as they happen at 4am local time.
Washington: A royal wedding pop-up bar will be open from 6:30am for the 7am local time ceremony, with a full English breakfast on offer inside a recreation of St George's Chapel. The British embassy in Washington is delivering handwritten notes from visitors to the bar to Kensington Palace, and have leant the bar a statue of a Beefeater, along with a Royal Mailbox.
New York: Last week eight corgis bounded through Herald Square in central Manhattan, to promote a television drama portraying their courtship. The show, Harry & Meghan: A Royal Romance, aired on Sunday - the night after CNN showed their documentary on the couple.
Humans wishing to emulate the pair, meanwhile, can book the Conrad Hotel’s “Propose like a Prince” package – two nights in their Conrad suite, a helicopter tour of the city, and a private consultation with the London Jewellers, based in TriBeCa, who are offering an exact replica of Ms Markle’s engagement ring. No-one's actually done it though, perhaps because it costs $10,000.
In the run up to the wedding, the Downton Abbey exhibition in midtown Manhattan has been holding royal wedding talks and etiquette lessons.
And on the day itself pubs will be open from 7am, and the British ambassador to the United Nations will hold a party, as will the British consul - at Harry's Bar, in lower Manhattan.
Lesotho
Prince Harry spent his 2004 gap year in the South African country, and in 2006 founded the Sentebale charity with Prince Seeiso, to support children in southern Africa living with HIV and Aids.
A street party is being held in the villages of Mohales Hoek to celebrate the royal wedding.
Belgium
The Telegraph asked the European Commission if Jean-Claude Juncker would be watching royal wedding and if the commission wanted to congratulate the happy couple.
"We are always happy when love is in the air," commission spokeswoman Mina Andreeva beamed.
"When it comes to President Juncker there’s so many things happening around the world so that will depend what the Saturday agenda whether he will tune in or turn his attention to more pressing matters.
"Certainly all the best of luck," she added.
Reporting by Alec Luhn in Moscow, Adrian Blomfield in Nairobi, Saptarshi Ray in New Delhi, Senay Boztas in Amsterdam, Rozina Sabur in Washington, Harriet Alexander, James Crisp in Brussels