Update. According to the TM at the gate, the concerts vary from 60 to 90 mins depending on the act. Tonight is the Steve Miller Band and the show starts at 8:30.
Reviving this thread with an even more basic question... what *are* the Mardi Gras concerts? We will be there (unintentionally) during Mardi Gras next year. Is the park busier for these events?