If I have to cancel my ATD 2021 conference registration after it has been transferred, what is the policy? Natasha Porter Updated April 27, 2020 14:20 Follow More information about the refund policy or participant substitutions may be found here. Related articles If I transferred from ATD 2020 to ATD 2021 and cannot attend the new dates, how do I change my registration? When can I learn more information about ATD 2021? How do I know if I am eligible to take the APTD exam? When will information about housing for ATD 2021 be available?