All cancellations requests must be made in writing to [email protected]
Requests received before September 30, 2021 will receive a full refund.
Requests received before November 30, 2021 will receive a 50% refund.
Refunds will not be issued after December 17, 2021
Please contact SIGMA headquarters at 703-709-7000 or email [email protected] for event refund information.