I recently had a request for a "Letter of Invitation" from a foreign business man for the Spring event in Tucson. There was a time when you could find these from almost every show promoter but that is no longer the case...I finally found what I was looking for from Lowell Carhart of Eons Expos.
For those of you who don't know what this is or its use - the basic concept is that this letter will show the U.S. consular officer who considers the visa application that the person applying has a specific plan regarding visiting (and eventually leaving) the U.S. This then accompanies the visa application for the consul.
Thanks to Lowell, there is no need to search each show website - now your Letter of Invitation has it's own website!
The link is: http://invite-letter.com/