This week marks the fiftieth anniversary of John Lennon and Yoko Ono’s Montreal Bed-In, the famous week when the couple settled into a suite of hotel rooms on May 26, 1969 and invited the world to join them. It’s an event that’s been satirized on The Simpsons and is now stamped onto a silver coin from the Royal Canadian Mint, and gave birth to the enduring anti-war anthem “Give Peace a Chance,” written and recorded live late one night.

Lennon and Ono were the focus of intense media attention and pursued with a paparazzi frenzy not seen since Elizabeth Taylor and Richard Burton earlier in the decade. So shortly after the counterculture power couple married in March 1969, they decided to put that celebrity attention to good use and turned their notoriety into a non-violent protest by staging a series of Bed-Ins for Peace. For the Japanese avant-garde artist, there was also the a durational performance-art angle. As Ono would later remember —“We thought it was a great practical joke that most of the world’s headline newspapers, especially the European and British, was: ‘Married couple are in bed.’”

The campaign actually began in their honeymoon suite at the Amsterdam Hilton. Then, because Lennon was unable to enter the U.S. at the time, it initially continued in the Bahamas. But the climate was too hot for their liking and too far removed from major media outlets; after an overnight stop in Toronto and with Ono’s five-year-old daughter Kyoko in tow, they headed to Montreal. Once settled in a corner suite at Montreal’s Queen Elizabeth hotel (now called Fairmont The Queen Elizabeth), to bring attention their protest against the war in Vietnam, they invited the world press to join them.

Behind-the-scenes, fly-on-the-wall documentaries of celebrities are commonplace now, but Bed Peace, the 70-minute documentary Lennon and Ono directed chronicling that period of their Campaign for Peace was groundbreaking in its access to both the famous and the banal. Their hundreds of visitors in Montreal included Petula Clark, activist Dick Gregory and comedian Tommy Smothers to cultural figures like Murray Kauffman, Al Capp and Timothy Leary. (Not everyone was on their side — cartoonist Capp, for one, called the project a gimmicky publicity stunt.) But engaging in dialogue was crucial.

The documentary “Bed Peace,” directed by John and Yoko and filmed by Nic Knowland.

And as the introduction to the documentary explains, “They approached the task with the same entrepreneurial expertise as an advertising agency selling a brand of soap powder to the masses,” the documentary explains. “John & Yoko’s product however was PEACE, not soft soap, and they were determined to use any slogan, event and gimmick in order to persuade the World to buy it.”

Over the course of eight days, with the bed pushed up against the window and surrounded by vases of blowsy white chrysanthemums and carnations, they wore white pyjamas to conduct interviews with reporters, have conversations with guests and friends, and read the newspaper. Cuddled up reading Lao Tzu, they ordered room service. Local Montreal rock station CFOX interviewed them daily, for commentary on everything from sweatshop labour to the police violence on student protesters at Berkeley. They hung the walls with hand-drawn signs of sketches and phrases like “Murray the K Comes on Monday” and “Bed Peace” (the latter original poster later sold at Christie’s auction for US $154,000).

Much of the Montreal bed-in was also documented by the late photographer Gerry Deiter, on assignment for Life magazine, in images that remained unpublished for more than thirty years because the story was pre-empted by the magazine for breaking news.

On the penultimate day of their stay, local music producer André Perry was enlisted to record what would become one of the era’s most famous anti-war anthems, “Give Peace a Chance.”

As Lennon strummed his famous 1964 Gibson (on which over the course of the week he’d drawn caricatures of himself and Ono) they invited everyone assembled in the room to join in. Clapping and stomping and singing the chorus of rhyming wordplay, riffs and puns, it was a playful song with serious purpose and released July 7, 1969—before the group had broken up, it became Lennon’s first non-Beatles single and climbed the charts.

Canada’s part in that major moment in pop culture history didn’t end when they checked out of the hotel. After a failed attempt to meet with Prime Minister Pierre Trudeau in Ottawa Ono and Lennon would return to Canada that December for a meeting and to hold a press conference to close their peace campaign.

Today, that suite at Fairmont The Queen Elizabeth has itself become a tourist attraction. A recent renovation includes reproductions of protest placards, archival photographs and clippings to honour its famous one-time occupants and their hopeful campaign. The lyrics to “Give Peace a Chance” are embossed on the walls, albeit in tidier handwriting than the hasty scrawl Lennon used to put up the words as he lead a motley group of strangers in a song to change the world.

As Ono says in her introduction to Bed Peace:

“Let’s remember WAR IS OVER If We Want It.

It’s up to us, and nobody else.

John would have wanted to say that.”

For information on Bed-In commemorative events happening in Montreal over the next week, go here