Okay, so you got a bunch of calendars for Christmas and you don't know which to use when the New Year rolls around, right?
Well, you could use them all, but that would cover all your walls. And windows. And floors. And ceilings. And-
You get the point.
On the other hand, you could use just one,. But when someone comes over and sees you're not using their calendar, they'll say "You're not using the calendar I gave you for Christmas? I thought you liked puppies!"
Well, I do, but hey - check out the puppies on Miss January. Oh, momma.
