AITAH for taking a job that I know may stop me from going to my sisters graduation?

so I’m a college student (20)and I got a low income scholarship that covered 2 years of school housing for me. for the last 2 years, i have to figure out housing for myself and i decided to lease a room near school (I live almost two hours away from my college and i have a difficult major so that commute would not have been great for me).

so I did some calculations and realized that even with my savings I still have a bit of a gap for rent, so I applied for a summer counselor job which will help me fill that last gap. The issue is the only camp that got back to me and accepted me is a camp that is far from my house and it starts right before my sisters graduation ceremony from middle school.

I am not sure if I’ll be able to get time off to make it to her graduation and I’ll feel so terrible because I know my sis will feel sad and I know my dad will be pissed cuz he doesn’t want me taking this job anyways because he feels like I’m trying to get away from the family too fast, but if I don’t make some type of money this summer i‘m at a serious risk of not being able to pay for my bills to stay near my school which will certainly put my academic career in jeopardy. Is there something else I could have done? Am I a bad person for this decision?