USA Visa Information
If you applied for your visa before May 1, 2019, and you are unable to attend because your visa was denied or you have not received a response we will refund your registration fees. Refund requests must be received within one week of the close of the meeting with accompanying documents showing a visa denial. See the Help menu for contact information.
Applying Online for a B-1 Visa to attend the ICML conference: https://www.usa.gov/visas#item-213289
Visa Waiver Program: https://www.dhs.gov/visa-waiver-program-requirements