​​​​Registrants with a login can make changes and cancellations online via My Registrations. Cancellations received/processed by July 27, 2021, are fully refundable. Registrants who cancel after July 27​, 2021​, and no-shows ​are responsible for paying the full registration fee. No substitution or cancellation refund is available once the web conference begins. If you have difficulty cancelling online, please contact Accounts Receivable at 703-907-6875, or fax to 703-907-5951.