Competitions for after exams

If your school is anything like mine, the weeks after Y12 exams are a bit of a nightmare with trips, events and Open Days. If you end up with half a class for a lesson, it could be worth setting them off on an essay competition. There are a few knocking around at the minute: I know of the Young Economist of the Year competition and the FCDO Next Generation competition, but I'll add any extras here as I find them.