Yes, every yacht charter will have a corresponding agreement for everyone’s protection that lays out the terms, prices, dates, number of guests, and many other conditions.
The contract protects both the boat and your charter party.
You, the charter broker, will sign the deal, sometimes the Clearinghouse or Yacht Manager, and the Yacht Owner.
Contracts are industry standard, differ depending on where you are, type of yacht, and kind of yacht vacation.