It is a short drive from each of the hotels in downtown Brooklyn. Ubers/Lyfts/taxis can get you there in about 10 minutes and there is valet parking on site.
It is whatever makes you feel most comfortable and festive. Short or long, suit or tux.
Weather permitting--yes! There is no grass at the Liberty Warehouse, so don't worry about shoes, as long as they are comfortable for dancing.
She has informed us she "already made plans that day."