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For International Travel

What Do I Need?

The first step to traveling to Canada is to determine admissibility followed by the Canadian Visa Application (step by step instructions and information below).

Am I Admissible to Canada?

Canada Immigration Guidance Information

The Immigration, Refugees, and Citizenship Canada Special Event Code for this event is 24UESI – please be sure to include this code in your online visa application.  We have also received Official Event Recognition from the Canada Border Services Agency (CBSA) International Events and Convention Services Program (IECSP) File # CAL_2024_13987.

Note: It is strongly encouraged to submit your request online (instructions in the link above) and note the conference code in the appropriate area.  This places your application in a specialized processing que within Canadian Immigration that has a much faster processing time than the traditional visa line.

For Visitors in Need of a Visa To Return To The U.S. Post Conference

If you need a visa, you will need to apply for the right kind of visitor visa.

It is normally a B1* visa: Attend a scientific, educational, professional, or business convention or conference for a business visit. *Please check current visa categories and requirements with the U.S. State Department.

Visa visitors must have a machine-readable passport and schedule an in-person interview with the U.S. State Department consulate or embassy. The application process varies by location. Please contact your local consulate for the most accurate information.

It can take up to four months to get an interview date. Please contact your nearest consulate as soon as possible to request an interview date.

If your visa application is denied, please inform ASCE in writing that you wish to cancel your registration. You should attach a copy of your visa denial.

A full refund will be issued if the cancellation notice is received by the deadline of July 26, 2023. No refunds will be made for cancellation requests received after July 26, 2023. Send cancellation requests to registrations or fax to +1 (866) 902-5593.

Please file your visa paperwork as far in advance as possible to be eligible for a refund.

ASCE cannot intervene on behalf of the invitees with the Embassy or U.S. Consulate via fax, phone, surface mail, or email. The U.S. State Department provides information on traveling to the United States regarding passports, international travel, and visas.

Letter of Invitation

Registration must be completed and paid in full before a Letter of Invitation may be requested. A copy of your registration payment receipt must accompany your request.

Please be ready to provide your complete official name, date of birth, physical address, email address, and passport number (if available).

If any additional information will be needed for the letter issuance, you will be notified by e-mail in response to the submitted request.


The Letter of Invitation will ONLY be sent by email to the email address that you provide. The Letter of Invitation cannot be emailed or sent to the Embassy or U.S. Consulate.

If you have any questions about Letters of Invitation, please contact us at [email protected]

Visa Waiver Program and ESTA

Travelers from VWP countries must have valid Electronic System for Travel Authorization (ESTA) approval before travel. U.S. Customs and Border Protection will handle emergencies on a case-by-case basis.

ESTA requires all international travelers from VWP countries to register in an online database. Travelers from VWP countries must complete an application on the ESTA website.


Travelers are not required to complete an I-94W form before each trip. The ESTA requirement does not affect U.S. citizens returning from overseas, people from VWP countries traveling on a valid U.S. Visa, or travelers from non-VWP nations.

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