There is the full spectrum from folks in full business attire and down to folks in jeans and sneakers. Wear what makes you feel comfortable as it takes almost two hours if you opt for the full four course experience.
Wear what you wish, and chances are good that there will be folks dressed both better and worse than you are. :-) Seriously, there really isn't a dress code, so just dress how you feel.
I've gone wearing everything from jeans and T-shirt to dressed up in a suit for a business meeting it all depends on what the overall party is wearing
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