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Refund/Cancellation Policy

All cancellations requests must be made in writing to Requests received before March 13,  2020 will receive a full refund. Requests received between March 13, 2020 and April 3, 2020 will receive a 50% refund. Refunds will not be issued after April 3, 2020.

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

Please contact SIGMA at or 703-709-7000 ext.1487 if you have any questions