Tips on convincing my parents to let me go to a concert?

I really want to go to Bamboozle - it's an outdoor concert at giants stadium with a huge deal of my FAVORITE bands. I really really want to go. I'm 14 and would be going with a big group of friends - boys and girls - and my older brother will be there (he's 17), two of my sister's friends, (both 16) and my friend's father (i don't know 40!? ha ha). My eldest sister who is now in college went to the concert when she was 15, which is only one year older than I currently am. I really want to go! What are some things that will reure my parents that everything will be safe?