Thanks 
Chiavari’s have to be rented and you can do that at any venue. They range from $6 to $8 per chair depending on the rental place. Have you seen Le Jardin? Their standard ballroom chair is very similar to a gold chiavari- that was the only venue I saw in the city that offered something like that.
I believe Kings Court rents chiavari’s too but I don’t remember the price now.
When you’ve got your venue, lets meet up and I’ll walk you through the process