CES 2020 Cancellation Policy Cancellations for paid registrations received in writing by Dec. 18, 2019, are refundable, less a $50 processing fee. After Dec. 18, 2019, cancellations are subject to the entire fee. If you do not cancel by Dec. 18, 2019, and do not attend the event, you are still responsible for payment.
https://www.ces.tech/Logistics/Registration-Information.aspx