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. Begin with a Polite Greeting.Your formal invitation letter should include a strong call to action for the recipient to RSVP. Write your reason for inviting them to be your "chief guest. " Tell them if they will be expected to speak to the group and if so, for how long. 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. In this article, we will cover how to write a professional invitation letter, with tips, samples, and guidance on how to make an impression on every guest. We've put together an email template to help you land podcast guests. One of the best ways to organically grow your podcast, branding and online influence is to invite guest speakers to your Podcast.