How To Write A Corporate Sponsorship Proposal Letter . Each year, [organization’s name] team works extremely hard to bring awareness and raise money for [cause]. Best practices for writing a sponsorship request letter avoiding boring pleasantries. Event Sponsorship Proposal Letter in Word and Pdf formats from www.dexform.com Ease up and follow the steps below on how you can effectively write a sponsorship proposal: Familiarize the sponsor with your company or organization. A sponsorship proposal entails writing a letter to request a fundraising.