"How did you end up speaking at this conference? If an invited speaker says they are not available or are not interested in speaking at your event, be graceful and thank them for considering the opportunity.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. First, do your homework. Know who the invitee is, what he or she stands for, why you want him or her. Public speaking is also called oration. It is presenting in front of a broad audience. My first recommendation to maximize your experience of being on a panel is to provide valuable insights to the audience.