Downtown Indianapolis hotels are virtually sold out for this weekend, with tens of thousands of Catholics and racing fans set to flock to the city for separate events.

The National Eucharistic Congress—the first U.S.-wide gathering of Catholics in more than 80 years—is expected to draw as many as 60,000 visitors to the Indiana Convention Center from Wednesday through Sunday, while NASCAR’s Brickyard 400 and related events could draw another estimated 60,000 people to Indianapolis Motor Speedway from Friday through Sunday.

According to tourism agency Visit Indy, about 80% of downtown’s nearly 8,400 hotel rooms will be occupied by the Catholic gathering on Friday and Saturday, the event’s peak nights, with thousands of other rooms being used for the stock car race, which is celebrating its 30th anniversary this year.

“With 60,000 attendees visiting for the National Eucharistic Congress and another 60,000 for the 30th anniversary of the Brickyard 400 at the Indianapolis Motor Speedway, this weekend is another example of Indy’s ability to host a wide array of events simultaneously,” Clare Clark, senior communications manager for Visit Indy, said in a written statement. “As Indy prepares for this influx of visitors, hotels are showing strong demand and compression throughout downtown and central Indiana with limited availability remaining.”

The National Eucharistic Congress, which is meant to help Catholics develop a deeper connection to their faith, will use about 27,000 room nights over five days. The organization has contracted with 88 hotels throughout central Indiana for the event.

Tim Glemkowski, CEO of National Eucharistic Congress Inc., said the event was “bumping up against capacity issues” even before the date for the Brickyard race was announced last year. Some attendees are staying at hotels as far as an hour from downtown Indianapolis—a typical occurrence with major events that book Indianapolis, including the National FFA Organization, National Rifle Association and Gen Con.

Thousands of attendees are also expected to stay at area rental homes through companies like Vrbo and Airbnb, as well as local churches or in university dormitories including Butler University, the University of Indianapolis, Marian University and Indiana University Indianapolis, according to Visit Indy and NEC officials. Several local retreat centers and recreational vehicle areas are expected to be used for the five-day event, too.

The last National Eucharistic Congress took place in St. Paul, Minnesota in 1941, less than six months before the U.S. became involved in World War II. The last major international Catholic gathering was held in 1976 in Philadelphia, drawing 1.5 million people over a single week.

Despite lodging restrictions, Glemkowski has said Indianapolis is an ideal spot for the national gathering because of its proximity to a large portion of the U.S. population. The church, he said, is focused on adding to its membership through specific outreach programs, rather than relying solely on individuals predisposed to joining or remaining in the church through cultural traditions or upbringing.

That’s why the church opted against hosting the event in a Catholic hotbed such as Boston, Chicago or Philadelphia, he said.

He said while the event is competing for hotel rooms with the race, Indianapolis Motor Speedway is offering a discounted ticket to Congress participants. There will also be a dedicated seating section for attendees, NEC officials said.

“Even in these competing moments we’ve still found that Hoosier hospitality to be present,” he said.

On Tuesday, four groups of pilgrims arrived in Indianapolis after separate two-month journeys from different parts of the United States. The groups, which traversed the country largely on foot, hail from San Francisco; Lake Itasca, Minnesota; New Haven, Connecticut; and Brownsville, Texas.

Those journeys drew more than a quarter-million people along their respective routes to offer encouragement and prayer, the organization said. The groups were welcomed to Indianapolis with a church service at St. John the Evangelist Catholic Church, 126 W. Georgia St.

The service, known as a liturgy, was led by Archbishop Charles Thompson, who oversees the Archdiocese of Indianapolis, and included the participation of a representative of Pope Francis.