Cocktail attire.
March in New Orleans is usually pretty nice in terms of weather. Expect temperatures to be in the 70s -- but it will probably be humid.
Up to you. While most places will require a short drive, Lyft and Uber are active in New Orleans, so getting around shouldn't be a problem even if you don't rent a car.
Yes. Check out the "Travel" page for more info. There, you will find a code for a complimentary Lyft ride to and from the wedding. We also have a shuttle that will take guests from the Westin to the Degas House and to all three hotels after the reception. There is another shuttle taking guests from the reception to the afterparty.
No. :) Check out the "Things to Do" page for some ideas that are way more fun than Bourbon Street, we promise.
https://www.nytimes.com/interactive/2018/travel/places-to-visit.html