The deadline to request a Letter of Invitation is November 1st. Complete one form per attendee, and be sure to include all required information.The invitation letter cannot be completed without including your hotel information and confirmation number. An invitation letter from you. Use the form provided below to generate a letter of invitation that can be printed out to obtain travel documents. The official ALA letter of invitation is to be used to facilitate the processing of any visas or documents needed for you to attend the ALA conference only. Clearly state what you are inviting the recipient to do and why it is important. This invitation can be personalized with your own party details. Fill in the text boxes below, and we will email you a complimentary proof before printing. Find out if you need a visa to travel to the U.S. here.