Which document outlines the terms of agreement with vendors?

The correct choice, which is the contract, serves as the formal document that outlines the terms of agreement with vendors. A contract clearly delineates the obligations and expectations of both parties involved, including pricing, timelines, deliverables, and any other specific requirements that need to be met. This legal document serves as critical protection for both the event planner and the vendor, ensuring that all parties are on the same page and have a clear understanding of their responsibilities.

While an agreement form could be used for alignment on general terms, it may not carry the same binding legal implications as a contract. A proposal typically outlines what services a vendor can provide and includes pricing estimates and service descriptions, but it does not establish an agreement until a contract is signed. A vendor slip generally refers to an informal document or receipt acknowledging a vendor transaction, but it lacks the detailed terms necessary for a comprehensive agreement.

In the context of event planning, it is essential to have a well-defined contract to avoid misunderstandings and to ensure that all parties are held accountable to the agreed-upon conditions.