Invitation letters are available to be picked up in the Center for International Programs and Services. This form should be used to request an invitation letter to initiate request for travel visas.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. The Suffolk County Community College Catalog is not intended to be a legal contract between the College and any person or entity and is published. You should include the name of the host, formal expression, the event purpose, date, time, and venue, contact details, and RSVP.