Summary: Dumbledore has a very good idea. True, it may be termed as 'illegal,' but when it concerns the happiness and futures of two sixth-years, James Potter and Lily Evans, 'illegal' isn't really important, is it? His portraits agree.

And while it could be said that two inexperienced students should never be responsible for a mass construction project and the hosting of an international festival... well, the teachers of Hogwarts have never really paid attention to propreity, have they?