Registration to an event 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.
The Letter of Invitation for visa purposes will only be sent by email to the email address that you provide. ASCE cannot intervene on behalf of the invitees with the Embassy or U.S. Consulate via fax, phone, surface mail, or email.
For specific information about registration and deadlines, review the "For International Travel" page on the conference website you are attending.