How can I get out tonight all night!??

I want to go meet some friends, but they live in a different part of the city to me, one quite far away! I would tell my mum i was going but if she new they were teenage boys, she wouldn't let me go! Iwant to go meet them and stay their all night with my friend but I cant tell my mum thats where I'm going, Can anyone think of what I can tell her? I CANT say I'm sleeping at a friends because she checks with their parents that I am, and if their parents aren't in they take a number.