Running paid membership website?
Then it's the best time in year to add new package, with 40-50% discount.
Make term annual (12 months), so you win in a long run, taking into account many members stop using website after 3-4 months in average.
Create nice banner with Christmas attributes announcing this perfect opportunity that ends, let's say January 1st, leading right to payment page.
And there is a great chance you will get payments from members that do not normally pay.

"Add 13ths month to your annual profit plan" (c) Me