Upstairs is usually more casual than floor. Expect cool A/C.
When i saw Fleet Foxes there it was casual
Dress as you would for a casual get together, maybe even a nice dinner
It depends on the type of performance.
I don't think they have a dress code. I've worn jeans and a hoodie both times I've been there.
Most people dress well. Cocktail attire to evening dress.
I would wear dressy clothes
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