I called up Disney, and they have the hours and the events schedule. Not sure why it is still not on the website yet, but they will tell you if you call them. Also, on the subject of Gradnight:
From what I understand it in not every single night in May. It is mostly on the weekends and it is only MK. So, why, oh why do people consistantly bring it up when discussing May hours???????????? It is not such a big deal that it effects the hours that much that they cannot post them. They are probably just trying to determine how park attendance will affect things and don't want to post them yet in case they change.