iacisrmma……….
We married off a daughter just before Pesach. We set all these details down ion the contract with the caterer including the fact that he’d take direction from our wedding coordinator. We would not allow the caterer to be in a position to dictate to us on the day opf the simcha. You can be sure that if the caterer violated the terms of the contrat drawn up by this attorney he would not have rec’d a check at the end of the evening, but an invitation to a beis din.
Discussing in advance is nice, but you need to get it reduced to writing in the actual contract.