Darren Criss, who plays out-and-proud Blaine Anderson on the Fox musical-comedy Glee, and gay icon Gloria Gaynor will be at this weekend's Northalsted Market Days – often described as Chicago's Gay Pride festival.

The 30th annual event offers 2 days of entertainment, food and arts and crafts along six North Halsted blocks between Belmont and Addison in Chicago's gay neighborhood Boystown. Northalsted Market Days is considered the largest street fair in the Midwest.

Criss will take the stage on Saturday, 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.