How can I get my boss to let me off work?

I work in a retail store as a part time employee. So my problem is that my dad bought me some pretty expensive tickets to an NBA game for my birthday a few months back but the game is 6 hours away from where I live so we will have to stay the night at a hotel and becaue of that I would need 2 days off work but the... show more I work in a retail store as a part time employee. So my problem is that my dad bought me some pretty expensive tickets to an NBA game for my birthday a few months back but the game is 6 hours away from where I live so we will have to stay the night at a hotel and becaue of that I would need 2 days off work but the days I would need off are New Years day and the next day after that because the game is on the night of New Years. My manager told me I might not be able to get off work because a lot of people in the store are requesting to have that day off. What should I do about this problem?
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