how do I convince my parents to let me go

How do I convince my parents to let me go to Glastonbury?
My boyfriend has two spare tickets.
But I know my parents will freak out if I ask to go.
I need some tact tips to deal with them.

Thank you.

x

-'All my friends are going too'
-'This is a one time opportunity'
-'I'll do anything to get the permit to go.. please!'
-'I bet you were doing the same things as this when you were young so why wouldnt you let me do them now?' <-- Works like a charm. :P

or if they still say no and you really still want to go just tell them that they are right you dont need to go and say you will make diffrent plans and go 'call your Grandma' wink wink and she will 'say' wink wink you can come over...then you drive over to your boyfriends and go to Glastonbury! : )