Consider setting up tastings to sample their food and determine if it meets your expectations. 4. Get quotes and negotiate: Reach out to the catering vendors and request quotes for their services. Compare prices, inclusions, and any additional fees. If the initial quote is outside your budget, don't hesitate to negotiate to see if there are any cost-saving options available. 5. Check references: Before making a final decision, ask for references from past clients. Contact these references to inquire about their experience with the catering vendor, the quality of service, and any potential issues that arose. 6. Sign a contract: Once you have selected a catering vendor, make sure to get all agreements and details in writing.