Start with a clear subject line that summarizes the meeting's purpose. For a formal letter invitation, it's best to explicitly point out the purpose, event goals, and the value it can bring to participants.The document provides a sample invitation letter and follow up script for inviting a Member of Congress to an event related to a transportation safety project. The purpose of the letter is to confirm that you will have a place to stay during your visit. Clearly state what you are inviting the recipient to do and why it is important. Learn how to set up or schedule a physical inperson meeting or virtual Microsoft Teams Meeting using the Outlook Calendar. We have curated 15 different templates for invitation letters that can help you write invitation letters with ease. This letter serves as an invitation for your participation in the meeting(s) outlined in the enclosed schedule. Include the Salutation. Write the Main Body of the Letter.