Is this a super dressy venue, or is casual ok ?

Casual is ok.

Casual or dressy. Your choice..

Casual is fine. A little dressy is nice but not required

Can be as dressy or casual as you want.

Casual is fine.

It really depends what you are most comfortable with. There's no expectation that you'll be dressed for a gala, but no one is going to look at you weird if you do decide to get all dressed up.