Thousands of fans yelled "Lumos" at once to switch on more than 75,000 Harry Potter LEDs in London, and Guinness made it official: the most people casting a magic spell at the same time.
London's busiest shopping street just turned into Diagon Alley, and it came with a world record.
Fans on Oxford Street set a Guinness World Record on Monday, Nov. 9, for the Most People Casting a Magic Spell Simultaneously. Thousands chanted "Lumos" together as the Harry Potter Christmas lights switched on at 6:45 p.m. local time, This Is Local London reported.
Guinness adjudicator Will Munford confirmed the record on the spot. "Harry Potter fans are officially amazing," he said. Guinness didn't share an exact headcount in the coverage, so the official number is still a mystery.
The display is the biggest-ever takeover of Oxford Street's holiday lights. It uses more than 75,000 LEDs and took more than three months to design.
Nick Frost, who plays Hagrid in HBO's upcoming series, flipped the switch with Warwick Davis, who plays Professor Flitwick, and British TV personality Sam Thompson. Fireworks followed.
"I have loved being Hagrid," Frost said. Davis called the show "a wonderful reimagining of everything that we know has come before."
What do the Harry Potter Oxford Street lights look like?
The lights stretch from Marble Arch to Tottenham Court Road, the full shopping strip. The big pieces are four house displays:
Size: Each one is 16 meters wide, a little over 52 feet.
Candles: Each display has 30 floating candles, a nod to the Great Hall ceiling.
Houses: Gryffindor, Hufflepuff, Ravenclaw and Slytherin each get one, with house banners flying over the street.
Stars: The Harry Potter pieces mix with the street's existing Sky Full of Stars lights.
A two-and-a-half-hour stage show from Hits Radio and Magic FM came before the switch-on, with performers including Kimberly Wyatt, Fleur East and Marvin Humes.
Is there a Harry Potter Christmas tree in London?
Yes, and it snows. A Great Hall-inspired tree stands in Hanover Square, just off Oxford Street. It has Harry Potter ornaments, a Sorting Hat on top and a snowfall effect every hour, on the hour.
The tree stays up until Jan. 5, 2027, according to Oxford Street's official site. Neither the site nor the coverage gave an end date for the street lights themselves.
What's inside the new Harry Potter Shop on Oxford Street?
The lights also celebrate the Harry Potter Shop Oxford Street, which opened Nov. 4 at 134-140 Oxford Street. Warner Bros. Discovery Global Experiences runs it, and it's the largest official Harry Potter shop in the U.K., at more than 21,000 square feet over two floors.
Retail Focus listed the highlights:
Diagon Alley: The whole store is themed to the wizarding shopping street.
Dragon: A big Ukrainian Ironbelly hangs over a Gringotts area, like the one that busted out of the bank in the movies.
Knight Bus: A full-size one sits near the back as a photo stop.
The Leaky Cauldron: A food counter only at this store, serving Butterbeer treats.
Exclusives: A Diagon Alley wand, an Oxford Street Funko Pop and MinaLima art.
"Step inside and you'll feel as though you've walked straight into Diagon Alley," said Karl Durrant, a Warner Bros. Discovery retail executive.
Why is Harry Potter taking over Oxford Street?
It's a giant ad, and a pretty one. Oxford Street's official site credits HBO and its series Harry Potter and the Philosopher's Stone, which premieres Dec. 25 on HBO and HBO Max. The switch-on included exclusive previews of the show.
Frost and Davis are part of a mostly new cast led by Dominic McLaughlin as Harry. Davis played Flitwick in the movies, too, so he's pulling double duty.
How do I see the Oxford Street lights?
They're free and outdoors, so all you need is a trip to London. Oxford Street is newly pedestrianized, so families can walk the whole stretch without dodging buses. The Tube stops at Marble Arch, Bond Street, Oxford Circus and Tottenham Court Road all land you on the strip.
Plan the lights for after dark, then the Hanover Square tree for its hourly snow. Just maybe skip yelling "Lumos" at strangers. The record's already set.
Article compiled and written by Kambrea Pratt (editor-in-chief), Derek Gibbs (beat editor) and the Pirates & Princesses newsroom. Pirates & Princesses is part of WebReef Media.
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Hat Tips:
This Is Local London via Yahoo News UK (Nov. 10, 2026), the record, switch-on time, display details, attendees and quotes
Oxford Street (oxfordstreet.co.uk) (Nov. 2, 2026), the Hanover Square tree, its Jan. 5 end date, house banners and HBO partnership
Retail Focus (2026), Harry Potter Shop Oxford Street opening date, size, features, exclusives and Durrant quote
Warner Bros. Discovery press site (March 27, 2026), HBO series cast and platforms
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