How do i persuade my mum..?

Ok, so i live in milton keynes, and tomorrow jedward are doing a signing in cambridge! i only found out yesterday and REALLY want to go! but she said no, so im trying to persuade her. i'm being nice and doing loads of chores today to show im 'responsible' and hopefully gonna find out some intresting family stuff do in cambridge! if anyone has any ideas of how i can persuade her or knows anything cool about cambridge plleeeeaaasee telll me!