"For the purpose of this offer, an Eligible Night is defined as any night where a member is paying an Eligible Rate or redeems a free night award for at least one night of their stay."
Offer FAQ's
The wording is confusing there:
"Eligible nights completed September 1, 2018 through November 30, 2018."
Going by what has posted, a night on Nov 30 with check out on or after Dec 1 should count.
The T&C's are somewhat clearer:
"All Eligible Nights under this offer must occur from September 1, 2018 through November 30, 2018 (“Offer Period”)."