Charles River, Xenogen and XenogenBio wish to enter into a business arrangement that will enable them to work together to market and sell the Creation Services. A marketing and promotion agreement is a contract between a marketing agency and client where the latter procures the former's services under certain terms.Sample Business Contracts. Use our marketing contract template to formalize the marketing arrangement between a digital agency and a business. Draft your contract with ease! In this article, I'll go over why marketing contracts are so important, the essential elements they should include, and five different templates you can use.