Is calling out of work for Christmas irresponsible of me?

I got scheduled to work on Christmas Eve (why even keep a retail store open on Christmas Eve?) from 1-6:30pm.
Most people are having family gatherings around that time, myself included.
I have a family gathering that starts at 5 and will probably be over by 6:30. No, they can't reschedule our gathering. So I'm calling out of work, is that justifiable?
It's not like a lot people are going to be shopping on Christmas Eve so I doubt they'll be busy...
Family first.
Yes
No
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Is calling out of work for Christmas irresponsible of me?
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