We'll detail everything you need to know about how to invite a guest speaker, from the earliest planning stages to drafting a formal speaker invitation letter. We are excited to invite you to join us as a featured speaker at this event.Letters will be available for pick-up at the ISSO front desk after PM two business days after submission. Below is a sample invitation to an event that you can send to a legislator or candidate. Letter to the editor: What type of people do we want to be? Using Snyder's invitation to OU and the protests that followed as insight. Your invitation should be a formal email (or letter). Outline the reasons why you've chosen them as the best person to speak at your event. Receive Confirmation. Once your application has been processed, eligible applicants will receive a commencement invitation letter from Registrar Services.