Another busy day: The 1st Saturday of June is Gay Day at the MK and the MK is very crowded that day.
I have visited during Memorial Day week and have found the parks and resorts not crowded during the week. Many kids are still in school during that week (Tuesday through Friday). The 3-day weekend portion of Memorial Day week, especially Saturday and Sunday, seemed more crowded, but many people leave the area on Monday. Memorial Day is the last Monday in May.