Went for a graduation. Causal attire there.
It depends on the event. For symphony production I usually wear a shirt and tie and my wife and daughters dresses. For a John Melencamp concert we wore jeans and t-shirts. No one is going to turn you away but it is a beautiful restored theater that is a wonderful place to dress up for a night out and enjoy the architecture as well as a good show.
Not sure. Just went for my graduation, but from the looks of the inside of the building it would probably be semi formal wear
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