If I transferred from ATD 2020 to ATD 2021 and cannot attend, how do I change my registration? Natasha Porter Updated February 08, 2021 22:27 Follow Please contact ATD Customer Care for assistance. Email email@example.com or call +1 703.683.8100/800.628.2783. Please see the ATD 2021 cancellation policy. Related articles Where do I take the APTD Exam? How can I sponsor your conference? If I transferred from ATD 2020 to ATD 2021 and cannot attend the new dates, how do I change my registration? When can I expect to receive a refund for ATD 2020? If I have to cancel my ATD 2021 conference registration after it has been transferred, what is the policy?