NO, CARS ARE NOT ALLOWED TO BE LEFT AT THE VENUE OVER NIGHT.
On your invitation if it is addressed to you and some else you are both invited. If your invite says your name and Guest, then you have a plus one. If it addressed to "the ----- family" the family is invited but confirm! If it is just addressed to you, you do not have a plus one.
No, unfortunately there is not but guests can get there own.
Cocktail hour. No jeans Please.
Please reach out to 703-895-7708 with your name and the question.