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Refund Policy

All cancellations requests must be made in writing to

Requests received before October 31, 2020 will receive a full refund.
Requests received before January 6, 2021 will receive a 50% refund.
Refunds will not be issued after January 6, 2021

If hotel rooms have been reserved in the SIGMA block, they must be cancelled prior to receiving any eligible refund.

Please contact SIGMA headquarters at 703-709-7000 or email for event refund information.