​​​Members with a login can make changes and cancellations online via My Registrations. Cancellations received/processed by April 30, 2024, are fully refundable. Registrants who cancel after April 30, 2024, will be issued a refund minus a $199 cancellation fee. Substitutions are accepted. No shows and registrants failing to cancel prior to May 14, 2024, are responsible for paying the full registration fees. ​If you have difficulty cancelling online, please contact Accounts Receivable at 703.907.6875 or​