Skate world or party?

ok so my cousin invited me to a skate world party for newyears. and its like an all nighter kind of thing. and then my bff asked me if i wanted to go to her new years party (her partys are the best.. no kidding) and she asked my dad for me. and he said ya because my mom might not want me to go to those all nighters. so then i canceled with my cousin but then my mom came home and said that skateworld was actually okayy. then my dad asked what i wanted to do.. but idk what to do. like my cousin asked before my bff and that was my original plan but then i cancelled on her for my bff but i kinda want to go to the party but idk if that would be wrong of me.. please help! before its too late!!