Just a page or two previously this is discussed. If you want to use your free room certificate or your upgrades, you can book a refundable room now and apply them later. You must be booked in a "Fairmont Room". The free room should be easy if you get the certs in time. The upgrades are based on space available when you request the upgrade, so if there are no suites when you receive your upgrade cert, you might be out of luck on them.