On Easter Sunday MK often gets to capacity and other parks tend to have their lightest day of the holiday season then (still very crowded at those parks but lighter in comparison to other days during that very crowded season). One thing to understand: absolutely nothing goes on at MK on Easter Sunday that does not also occur the other days of that holiday season. For example, the "Easter" parade, which is simply the daily parade at 3 with some Easter themed floats added, goes on during the entire week leading up to Easter.