Comerica Bank Free Prix Day returns Friday, May 30, offering fans free general admission seating in Grandstands 1 and 9 to kick off the Chevrolet Detroit Grand Prix presented by Lear. No ticket needed—just show up early, grab a seat, and enjoy a full day of on-track action and fun at the Grand Prix. comerica_bank #WeDriveDetroit // #FreePrixDay // #ComericaBank