DD (14) has been invited to a party which starts at lunch time and ends at 11pm. She's been to gatherings at this friend's house before, and parents seem nice. There are quite a few kids going and plan is to catch the bus into the city centre and then staying out until 9pm when they will catch the bus back again to the birthday girl's house. It's minus temperatures outside at the moment and dark at 4.30pm. All her friends are going so don't want her to be left out, but also don't like the idea of her walking around outside in the dark and cold until 9pm...