See Luke Bryan September 1st at Wrigley Field. All you need to do is guess the 7-Digit code to unlock the Hi-Lo Trip Machine. Listen each weekday at 7:40 am, 8:40 am, 10:40 am, 12:40 am, 3:40 pm & 4:40 pm. When you hear the cue to call be caller 13 and step up to the plate with your 7-Digit Guess. The DJ will let you know if you are too High or Too Low. Keep track of the guesses for your best chance at getting it right.