The EMH is Sunday at MK. That may help you for an hour or two, but the park should be one of the busier ones that day. I think Mon, Tues, Wed are your best days for MK.
EMH can affect park attendance, however in my experience, the MK continues to remain fairly peaceful on Sunday. I think that because Spectro runs on Saturday night more visit the MK on Saturdays and then choose another park the following day.