Members with a login can make changes and cancellations online via My Registrations. Cancellations received/processed by October 24, 2018, are fully refundable. Registrants who cancel after this date will be issued a refund minus a $175 cancellation fee. Substitutions are accepted. No-shows and registrants failing to cancel prior to November 8, 2018, are responsible for paying the full registration fee. If you have difficulty cancelling online, please contact Accounts Receivable at 703-907-6875, or fax to 703-907-5951.