If you have a porta-john aversion, you can walk the 5 minutes back inside the casino your wristband gets you back into the concert area. The lines at the porta-johns were not bad at all. All the outdoor shows are rain or shine and there is no pavilion seating (roof) over the reserved seats like there are at some places like DTE Theater in Clarkston, MI.
Also there is a large hill behind the reserved seats for General Admission seating. It is an ampitheater with reserved seating on what would normally be referred to as 'main floor' but these seats are connected and not moveable like most main floor seating setups. I enjoyed the acts but I also liked the venue.
This is the second time I have attended a concert there (Train/Gin Blossoms in 2014). My wife and I made the two hour trip from metro Detroit area so that I could attend the Def Leppard/Tesla concert at the outdoor venue (they have a smaller indoor facility for some events) while my wife did some gambling in the casino.