​​​​​​​​Members with a login can make changes and cancellations online via ​My Registrations. Cancellations received/processed by June 10, 2023 for Group 1, are fully refundable. Cancellations received/processed by August 12, 2023 for Group 2, are fully refundable. Registrants who cancel after these dates will be issued a refund minus a 50% cancellation fee. No-shows and registrants failing to cancel prior to July 10 or September 11​, are responsible for paying the full registration fee. ​​If you have difficulty cancelli​ng online, please contact Accounts Receivable at 703-907-6875,, or fax to 703-907-5951.