Yes grads come in after MK is closed, but MK will close early on grad nights (Fridays and Saturdays). Usually they last about 3 weeks, so hopefully the days posted are correct. We are there the first 2 weeks of May and have been going in late April early May for over 10 years now. Never a problem, other than an early MK closing and usually no e-ticket nights, late openning at PI during Grad activities, and a shortage of parking near PI. Lots of proms at the conference resorts too. (No e-ticket nights during our 15 days stay last year--haven't hear yet about this year)