My dd has made a new best friend at secondary school. She invited her for a sleepover this Friday night . The girl's mum said her dd wanted to go to her old school Christmas fair on Saturday, so my dd could go to them and they can all go to the fair. My dd is all for it. I am nervous , because I don't know the parents. My dh is furious and acting as if I am sending her into drug/sex hell. Should I let her go? I think I should.