Once you, the corporate planner, has signed the contract and sent it to the hotel, ask the hotel to counter sign the contract and return this dual signed contract to you.
The contract is not enforceable without both parties signature.
*Under extreme circumstances, a hotel could opt to not hold up their end of the bargain (provide your group with guestrooms, meeting space, etc) unless they have counter signed the agreement, or contract, and you are both in possession of dual signed contract.on]