(ANSWER FAST!!!)How Can I convince my Parents to allow me to go to Six Flags?

Okay, so I'm in this church group which is going on a Trip to Six Flags, but my mom says I can't go. This is the second time she said I can't go anywhere. (The first was a sleep over to my buddy's house) Two Fathers of the church are coming and a lot of people that will be chaperons. Kind of like a school field trip. And I haven't gone to Six Flags since 2008. And I REALLY REALLY want to go. My buddy that had the sleep over is part of the church group too. But my mom said that my cousin has to come over with me. But.. 1: She's too old 2: The group is in ENGLISH not Spanish 3:The way she dresses is NOT appropriate for church, and especially for the 2nd year highschoolers that attend this program. 4: She doesn't believe in God or Catholicism. (She doesn't even know ONE prayer) 5: She'll ask to go home after the trip because at 9:00AM we will go to Six Flags. We will return to the church at 8:00PM. And until 10:00PM, we'll be back. So yeah, she'll be bored for two hours. Please answer and help me, because the form is due later on today, or early tomorrow!!! :(