​​​​​Members with a login can make changes and cancellations online via My Registrations. Cancellations received/processed by October 8, 2021, are fully refundable. Registrants who cancel after these dates will be issued a refund minus a 50% cancellation fee. Substitutions are accepted. No-shows and registrants failing to cancel prior to November 8​, 2021​, are responsible for paying the full registration fee. Special events or ticketed item fees are non-refundable. ​If you have difficulty cancelling online, please contact Accounts Receivable at 703-907-6875,, or fax to 703-907-5951.