Expect to see crowds of "Glee" fans outside the Michigan Theater on Thursday morning, as the long-anticipated free concert by Darren Criss finally takes place.

Criss stars on the hit TV series and is currently in the midst of his first concert tour. But the University of Michigan graduate's first taste of fame came while still a student at U-M, as one of the creators and stars of the Harry Potter spoof "A Very Potter Musical," which became a sensation online. The band on his current tour consists of friends from his U-M days.

Criss' "Listen Up" tour is crossing the country, but the stop in his college stomping grounds is the only show on the tour that's free. That's because it's part of the Bank of Ann Arbor's "Sonic Lunch" summer concert series. Admission to this special show is by wristbands, which have been awarded at a series of giveaways held in person and online. The final batch of wristbands will go to those lining up outside the theater starting at 6 a.m. Thursday.

The concert is set to start at 11:30 a.m. Thursday. Watch AnnArbor.com throughout the dayfor coverage of the event.