Cancellations must be received in writing via email to firstname.lastname@example.org or via fax to 703-610-0203. A processing fee of $75 will be charged for cancellations received on or before 1 March, 2019. No refunds will be issued for no-shows. Refund requests will not be accepted after 1 March, 2019. Not all requests will be granted. Substitutions for attendees are accepted at any time.