John Stamos finally played Riot Fest on Saturday, but that wasn't the only noteworthy happening at the Chicago institution. Hanson and Blink-182 both covered Descendents with Stephen Egerton. And during IDLES' set Sunday, their fellow big-font performer Jack White showed up to bring his signature guitar mastery to "Never Fight A Man With A Perm" from 2018's Joy As An Act Of Resistance. Check out footage of the big moment below.
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