Book at least 3 days in advance and stay on the Free Night Fall rate for two or more consecutive nights, Sunday-Thursday, at participating Country Inns & Suites By Carlson hotels in the U.S. and Canada between October 1, 2012 and November 29, 2012.
Register that stay on or before December 22, 2012, and they will send you a Free Night Reward Certificate that you can use for a free night between December 15, 2012 and February 15, 2013. Here is the link.

To receive the Free Night Reward Certificate (“Certificate”), guests must:
(1) complete an Eligible Stay; and
(2) register the Eligible Stay online with their confirmation number, name, and complete mailing address (“Registration”).
Guest will receive an email approximately two weeks after their Eligible Stay with Registration instructions. Registration must be completed and received on or before 11:59 PM CST December 22, 2012 to be eligible to receive Certificate. Certificate will be mailed to the guest at the mailing address provided during Registration within two weeks of completing the Registration.