If you have made a reservation in the USCHA group block at the Marriott Marquis hotel they will automatically cancel your reservation and process refunds for any deposits. Refunds will be issued in 4-6 weeks. It is not necessary to contact the hotel to cancel your reservation.
If you made a reservation OUTSIDE of the USCHA group block, you should contact the hotel directly to cancel your reservation.
Additional information about cancellations for the Courtyard hotel will be posted soon.