You are welcome to use the invitation letter template provided on page 2 of this guide to prepare a customized letter. 2. Complete the Invitation Letter form.Dear Honorable Consul: My name is (Last Name), (First Name) and I reside at (Your U.S. Address). Write a letter of Invitation. Please refer to the template letter to prepare a customized letter. Use an appropriate tone. This letter needs to be a well-formatted and formally written letter with proper information about the venue, date, time, etc. Learn how to create an invitation letter for a visa application with tips, format guidance, and examples to make the process easier. Students who would like to write their own invitation letters for their family members can use the Sample Invitation Letter template here. Make your VISA appointment as soon as possible if you intend to attend CROI 2025, as some countries require up to a year to process visa applications.