It's not a gala, so you don't need tux & gown. But dress should be more nearly formal. Imagine seeing a photo of yourself at this event- how would you want to be captured/remembered at the event? It never hurts to be slightly overdressed, but you'll always feel awkward being underdressed.
Semi formal is best
I'd say business casual and up...
Uou would have to call them and maybe they can help you.
Semi formal is always good, you can lean casual of course however most will dress semi formal
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