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. Discover a professionally crafted sample letter of invitation for a guest speaker.- In the opening paragraph, briefly introduce yourself and state the purpose of the letter. Craft a Formal Invitation Letter in Word, PDF, Pages, or Google Docs to invite guests with elegance and provide clear event details. We are excited to invite you to join us as a featured speaker at this event. Begin with a Polite Greeting. You should write the invitation using the third person instead of the first person and keep the same continuous verb tense. A good followup shows that you appreciate their time and are able to communicate professionally. Make sure you send the email as soon as possible. I am writing this letter to inform you about the upcoming__( mention the occasion or the event) It has been a while since we all have met up.