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 would be honored to have you as a speaker and would be grateful for the opportunity to share highlights of our research program with you.- In the opening paragraph, briefly introduce yourself and state the purpose of the letter. Your invitation letter will be prepared on official AIS letterhead and a PDF will be emailed. Please complete the request form to be considered. To obtain an Official Letter of Invitation for your visa process, please complete the form below. Each month we will feature a regional leader as a keynote speaker. All manufactured stages shall be quality tested at 1.2 times the working load. Hydraulics: Leveling and Set-Up. (Hydraulic).