When the 21st annual Warped Tour pulls into Tinley Park on Saturday, the traveling punk festival will be older than many of the fans who show up. While the fest has aged, though, its image hasn’t: unless you’ve seen the Warped Tour crowd with your own eyes, you probably picture swarms of suburban teenagers into poppy mall punk. But no institution that survives by catering to the tastes of kids stays static for long. Almost ten years ago, the arche­typal mall-punk style that peaked along with Fall Out Boy in the mid-2000s—fast and bratty, with sugary, accessible hooks and snotty-sounding vocals—gave way to breakdown-centric subgenres (crunkcore, crabcore, metalcore), which have themselves subsequently gone out of fashion. It’s represented today by the likes of Canadian band Simple Plan, who had their heyday in the early aughts (and who appear on this year’s Warped Tour).

When Knuckle Puck played Reggie’s Rock Club last year on a tour with Man Overboard, Maida told me how they came to play the kind of pop-punk that Zarrillo grew up on—they wanted to fill a void in the south-suburban scene. “There were literally no bands playing our style of music. It was a bit like, you’re either a metalcore band or a real poppy band. None of us were really into it, and we wanted to do something that our specific hometowns have never really heard before,” he said. “For me personally, the main motive with Knuckle Puck was just to be a local band that people actually wanted to go see—a local band that I would be like, ‘I’m going to every single one of their shows just because I love their music so much.’”

Knuckle Puck started attracting a significant audience outside Chicago with the 2013 EP The Weight That You Buried. When Property of Zack premiered “Your Back Porch,” Zarrillo says the site was pulling in about a million page­views a month, and the Knuckle Puck song got a lot of traffic. His job as the band’s manager is almost an extension of what he began on his blog: “I knew I wanted to work with them,” he says. “I wanted their music to be heard by more people, and I thought I could help them do that.”

Sat 7/25, 11 AM (order of acts announced that morning) Hollywood Casino Amphitheatre 19100 Ridgeland Ave., Tinley Park 708-616-1616vanswarpedtour.com $39.50 All ages