Indie rock band Peter Bjorn and John will perform at Dillo Day on May 28, Mayfest officials announced via a campus-wide scavenger hunt Monday.

Fifteen letters were hidden in boxes wrapped like presents around campus. Mayfest invited students to search for the letters and return them to the rock, where Mayfest members strung the letters along a clothesline at The Rock, gradually spelling out the band’s name.

It marked the first time Mayfest has done an interactive announcement.

Katie Chilton, a Weinberg freshman, came up with the idea.

“I was supposed to do an event on May 1, but we were having contract problems,” she said. “We had to come up with something that could be done at any time without much preparation, and I figured everyone loves presents.”

The Swedish indie rock band joins nighttime headliner B.o.B, daytime headliner The New Pornographers, hip-hop duo Chiddy Bang, DJs N.A.S.A. and Kill the Noise and Battle of the Bands winner whysowhite on the Dillo Day lineup.