​​​Members with a login can make changes and cancellations online via My Registrations​. Cancellations received/processed by October 22, 2021, are fully refundable. Registrants who cancel after October 22, 2021, will be issued a refund minus a $2,500 cancellation fee. Substitutions are accepted. No shows a​nd registrants failing to cancel prior to November 8, 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