With thousands of people gathered for the Rock in Rio Festival in Brazil, featuring acts such as Katy Perry, Rihanna, and Red Hot Chili Peppers, more than 300 young evangelicals wore "Jesus" T-shirts in a mass outreach effort at the event, which opened on September 23.

Members of the "Victory Youth in Christ," a group of Assembly of God Victory in Christ Church, in Rio de Janeiro, came to the seven-day Rock in Rio concert to bring the message of Christ.

Their T-Shirts presented the message: "For a better world, only Jesus," which alludes to the motto of the Rock in Rio "For a better world."

Placards with the same message were also placed on the Avenue of the Americas, near the event location.

The participants were holding banners and fliers on the streets near the so called City of Rock and in front of the venue.

The event featured renowned names in pop music such as Katy Perry, Rihanna, Elton John and Brazilian Claudia Leitte.

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Artists such as NX Zero, Stone Sour, Capital Inicial, Snow Patrol, Red Hot Chili Peppers and Metallica also performed during this weekend.

Other groups also joined the efforts to bring participants to Christ. Baptist Youth Carioca and the National Mission Board (Junta de Missões Nacionais – JMN) worked together to develop evangelism strategies and prayer for the outreach.

Others worked individually to save souls during the show. Antônio Cândido da Silva, 48, an evangelical Christian was preaching while working as a cleaner in the festival.

“I’m not for this music, but I’m not against it either,” Mr. da Silva said, according to New York Times. “What I do know is that Jesus loves you and every soul who is attending this festival of sin.”

Silva, who works for Rio’s municipal cleaning company, preached as he attended to his day job.

The huge music festival, which ranks among the world’s largest, sold out more than its 600,000 tickets in just a few days in May. Some of the biggest names in music will feature during the event that runs through Oct. 2.