​​​Members with a login can make changes and cancellations online via My Registrations​. Cancellations received/processed by October 1, 2021, are fully refundable. Registrants who cancel after October 1, 2021, will be issu​ed a refund minus a $2,500 cancellation fee. Substitutions are accepted. No shows and registrants failing to cancel prior to October 11, 2021, are responsible for paying the full registration. Special events or ticketed item fees are non-refundable. If you have difficulty cancelling online, you may contact Accounts Receivable at 703-907-6875 or