Why won’t my mom let me celebrate Halloween?

One time when I was younger and hanged out with my dad on Halloween he got me a costume and took me trick or treating for the first time when I was 10 but my mom get angry with him for taking me. A few years ago she even got mad at me for going to one of my friends Halloween parties
Why won’t my mom let me celebrate Halloween?
Why won’t my mom let me celebrate Halloween?
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