Working Easter Sunday

[CMYKguru]

Place I work isn't even open on Easter Sunday but I was told 5 minutes before leaving my previous shift that I was to work Easter Sunday on a different shirt.

Not entirely happy as I feel they've deliberately made this known a few minutes before leaving.

I'm on a P/T contract but just interested is this legal or the norm.

I was planning on putting away few chocolate eggs into my cheeks like an ambitious hamster.