If you or a colleague are planning to attend Digital Signage Expo 2015 and require a Visa Invitation Letter, you will find it available to you through attendee registration. The registration website will recognize that you require a Visa Invitation Letter once you enter in your location.
After identifying that a Visa is needed, foreign travelers should contact the U.S. Embassy Consular Section in their country to determine Visa processing timeframes. We recommend contacting the Consular Section via the Internet at www.usembassy.gov. Look for posted timeframes on the Internet or call the Consular Section to hear recorded information about Visa processing timeframes. The State Department's recommended first source of up-to-date Visa information is its Web site, travel.state.gov/visa/visa_1750.html.