Black tie optional. Reference this useful guide from The Knot for what that means! https://www.theknot.com/content/what-to-wear-formal-black-tie-optional-black-tie-invited
No. The ceremony and reception will be held at the same place so there will not be transportation provided. There are plenty of Ubers/Lyfts/Taxis in the area if you plan to stay outside of walking distance to the venue.
Please indicate on your RSVP if you have any dietary restrictions that need to be accounted for. If you have a severe allergy, please let the Bride and Groom know directly.