Just because there will be adults there doesn't mean they are considered responsible. In this day in age trust is a major issue considering all of the sick and twisted things happening to people. Just because your parents paid for this doesn't mean that gives you the right to go...although they were dumb enough to waste that money for no reason at all. Why pay for something if you can't even show up? Or you must've done something that ruined the trust with your parents in the past, and they still have a problem trusting you. I can't say...I don't know your parents, the entire situation, and it's none of my business. But if your mom says no, she means no. Most likely if you've asked five million times already you're still going to get the same answer. Maybe she has something else planned. If you need to know why you can't go she's most likely going to say something along the lines like, "Because I said so", and she doesn't have to give you an answer. You keep nagging your mom, she's going to get very annoyed with you. She's made her decision, now deal with it. There's still a VERY slim chance you could still go, but I wouldn't get your hopes up. Apparently she's said no for a reason, and she doesn't have to tell what the reason is.
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Oh yeah, and because you posted this address in your question, I think that was a rather dumb thing to do. Like I said there's a lot of sick people out there that are capable of doing just about anything.