Ok...one issue not being looked at iis how one-sided this contract is. I believe it would be laughed at and thrown out of court. This contract has NOT been negotiated in advance.
My advice - emergency meeting with your current client and tell them you will not pay this, nor sign the venue's contract. You have a contract with the B&G, NOT the venue.
Signing this sets you up for many problems down the road.
Coincidentally, there is a wedding planning company that has managed to get exclusive contracts with two higher end places so that only their Djs, photogs, etc get to work there. If the B&G choose someone else, they have to pay an additional $250 fee PER VENDOR.
These are dangerous precedents being set that need to be crushed as soon as possible.
In small claims or civil court, Nothing is ever laughed at and thrown out.
maybe in criminal court for absurd charges but on in small claims.
What happens is that they get the two parties together to negotiate to the last minute.
then if they cannot agree, the judge will tell them that it is very rare that one party will come out of this the way they expect. In other words, do not expect it to be totally to your favor.
Just a tidbit from someone who has been sued many times and have been in SC court as well as sued for 2 million dollars from the city itself!!