How do i get off groundation??? HELP PLEASE!!!!?

I want to go to one of my best friends house tommorow or saturday...... but i am grounded cause i pierced my ear without my mom knowing. I was only grounded for a week but i really want to go to my friends house cause we are all going to homecoming (all of us are: Promise, Frankie, Gabriella,Kaytlin, and 3 guys Edgar, Andrew and trevor) (my parents dont know bout the guys) but we are all going to homecoming and i really want to go cause edgar is my ex and we are going to get back together!!! SO I REALLY REALLY WANT TO GO!!! I ONLY HAVE 2 MORE DAYS OF GROUNDATION BUT I WANNA GO TOMMORROW!!! SOMEONE HELP!!!