Semi-formal spring vibes! Don't worry about it too much.
Yes!
Not really a frequently asked question but... No! The venue is old and does not allow red wine for fear of spills and damage to the building or art.
You can park in the lot of the First Baptist Church. It's right next to the Branch building, on North Robinson Street.
Come as you are! No dress code, but if you want to go all out, PLEASE do!
Hull street does not have a lot of parking, but the surrounding blocks do. Bainbridge usually has space, or the one way streets in between Bainbridge and Hull.