Darren Criss, who plays out-and-proud Blaine Anderson on the Fox musical-comedy Glee, will perform at Chicago's 30th annual Northalsted Market Days – often described as the city's Gay Pride festival.

The 2-day street fair – considered the largest in the Midwest – offers entertainment, food and arts and crafts along six North Halsted blocks between Belmont and Addison in Chicago's gay neighborhood Boystown. The fun begins on Saturday, August 13.

Criss is expected to take the stage on the festival's opening day at 4:30PM on the Rivers Casino Stage located at Addison and North Halsted. Disco diva Gloria Gaynor will perform on the same stage on Sunday night at 8PM.

The 24-year-old Criss moved his theater troupe StarKid to Chicago from the University of Michigan last year. Criss starred in the group's 2009 YouTube viral video A Very Potter Musical.

More than 30 additional artists will perform on the festival's four stages, including Tom Hadley of Spandau Ballet, American Idol's Frenchie Davis and power-pop band Dot Dot Dot – who reached a top five spot on Fox's The Next Great American Band in 2007.