Pretty much anything goes, but don't be a total slob.
I'd say casual/business casual. Depending on the occassion, you can dress up or down. While celebrating my dad's birthday, most of us were dressed buisness casual...while some guests dressed up denim & others were in elegant club attire because of the occassion they were celebrating. Although I didn't see a sign, but I'm sure athletic attire isn't allowed.
Casual
Casual definitely
Anything casual yet snappy. I'd say a sweater/button down and nice pants etc
Including jeans and a tee shirt...
casual- business casual. You will be fine with anything above jeans and a tee shirt
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