Chicago Open Air 2019 takes place at SeatGeek Stadium in Bridgeview, Illinois. The 2-day music fest is May 18 & 19, 2019. The performer lineup includes System of a Down, Tool, Ghost, The Prodigy, Meshuggah, Gojira, Beartooth, In This Moment, Code Orange, Fever 333, Knocked Loose, The Black Dahlia Murder,…