MIERCUREA CIUC, Romania — More than 35,000 Catholic pilgrims congregated Saturday at an open-air shrine in Romania for a centuries-old procession that was canceled last year due to the coronavirus pandemic.

The service in Sumuleu Ciuc, located in Romania’s Transylvania region, is dedicated to the Virgin Mary and dates back more than 450 years. Participants were urged to observe a number of coronavirus-control measures, including wearing masks.

Faithful gather for a mass during the traditional Roman Catholic Pentecostal festival in Sumuleu Ciuc, or Csiksomlyo in Hungarian, Romania, Saturday, May 22, 2021. The Pentecostal pilgrimage to Csiksomlyo dating back to 1567 attracts hundreds of thousands of people every year as this is the most significant religious procession of the Hungarians living in the Carpathian Basin. (Credit: Nandor Veres/MTI via AP.)

But for the tens of thousands of Catholics in the overwhelmingly Christian Orthodox country who attended in droves, resuming their faith’s biggest national event was a welcome step towards normality.

“After a difficult period, we can celebrate together again this year!” Csaba Borboly, council president in the predominantly ethnic Hungarian Harghita County, wrote online.

Many pilgrims wore traditional ethnic clothing, some arrived on horseback, and some traveled long distances by foot to a hilltop shrine dedicated to the Virgin Mary. Shortly after midday, Bishop Laszlo Kerekes of Tharros celebrated Mass with the sea of worshipers.

The event organizers also saw the massive religious gathering — which in recent years also attracted thousands of foreign pilgrims — as an opportunity to tackle the ongoing coronavirus pandemic.

A no-appointment-needed “vaccination marathon” was set up near the Franciscan Church for those wishing to receive a vaccine against COVID-19.

“We wanted to create a vaccination opportunity to put an end to the pandemic for good,” Tar Gyöngyi, executive manager of the Health Directorate in Harghita County, told The Associated Press.

“This pandemic is like a dragon. Until we cut off all of its heads, it will not go away,” he said.

A man stands next to an icon during a Catholic pilgrimage attended by tens of thousands who joined their faith’s biggest religious event, in Sumuleu Ciuc, Romania, Saturday, May 22, 2021. More than 35,000 Catholic pilgrims congregated at an open-air shrine in Sumuleu Ciuc in Transylvania on Saturday for an age-old procession that last year was canceled due to the coronavirus pandemic. (Credit: Andreea Alexandru/AP.)

Among the people who rolled up their sleeves for a shot was an influential Franciscan monk, Csaba Böjte. He runs a foundation for homeless orphans, and last year he suffered from a severe case of COVID-19.

“I was in the hospital,” said Böjte, who received his vaccine after Mass. “I have buried quite a few people who died of this disease. I trust our doctors and I hope this will benefit my health and I hope we can defeat this pandemic.”

Franciscan monk Csaba Bojte prepares to get a Pfizer-Biontech COVID-19 vaccine at a center setup near a church during a Catholic pilgrimage attended by tens of thousands who joined their faith’s biggest religious event, in Sumuleu Ciuc, Romania, Saturday, May 22, 2021. More than 35,000 Catholic pilgrims congregated at an open-air shrine in Sumuleu Ciuc in Transylvania on Saturday for an age-old procession that last year was canceled due to the coronavirus pandemic. (Credit: Andreea Alexandru/AP.)

The Catholic service dates back to 1567, when John Sigismund Zapolya, the first prince of Transylvania, tried to convert local Catholics to the Unitarian faith. The Catholics fought back and won, returned to Sumuleu Ciuc each year on the first Saturday before Pentecost to honor the Virgin Mary.

When Pope Francis conducted a Mass at the Sumuleu Ciuc shrine in 2019, around 80,000-100,000 people turned out.

Romania’s ethnic Hungarian population numbers around 1.2 million and mostly is based in the Transylvania region, which before the end of World War I was part of the Austro-Hungarian Empire.