CHICAGO - Riot Fest is marking its 20th anniversary this year with a star-studded lineup, a new "Riotland" attraction and finally, the arrival of John Stamos.

The backstory:

Festival founder "Riot Mike" Petryshyn said the decades-long back-and-forth with the "Full House" actor began in 2013 when the festival jokingly tried to recruit Stamos’ fictional band, Jesse and the Rippers.

Instead of a performance, organizers unveiled a butter sculpture of the actor – a gag that has now evolved into Stamos’ real-life appearance at the punk and alternative music festival this fall.

Dig deeper:

Petryshyn even got a tattoo of the butter sculpture to cross off one of Stamos’ many playful demands for attending. Other conditions included creating an official Chicago pizza in his honor, banning eye

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