Comprehensive guide to writing an invitation letter for your US visa application, with free samples and tips. Can the church provide you an invitation letter to watch general conference if you are not living in the United States to apply for a visa?The template is designed in both A4 and US letter sizes, accommodating international and domestic visa requirements. Step Two – Send the Letter of Invitation. □ Your Cuban colleague(s) will need an invitation letter to present at the time of the Visa. Full Name and Contact Information – The letter should begin with the host's full name, address, and contact details. There is no requirement for an invitation letter. If you want to send on send it to your parents who in turn may present it to the US consulate.