Casual. Nicer casual on Wed and Sat nights.
Smart Casual on Wednesday & Saturday evenings.
Casual, pretty much anything but swim suits.
I wouldn't even say "formal". Men have to wear collared shirts. As long as you wearing something fairly nice, you're good. Some women will wear dresses, others just nicer clothing. Other days casual is fine.
On Wednesday nights it is formal but other nights it is "smart casual".
Thanks! Your answer is awaiting moderation.