Christmas venting

Today in our store I was informed that if Christmas fell on a a day we were regularly scheduled (it didn't land on someone's normal days off) management would add a day to your schedule ignoring availability and expect us to show up. It's ticking a good amount of my teammates off. And it's far from the first time our HR has screwed with our availability. Is it a normal thing in the company to change/ignore availability like this? It seems almost like our management is trying to spite us over a national holiday.