A.Easter always falls between 22 Mar-25 Apr, on the 1st Sunday after the 1st full moon on/after the spring equinox (21 Mar, when day and night are equal).
Q.Why do we have pancakes on pancake day
A.Shrove Tuesday (Pancake Day) is a day of feasting before Lent begins (Ash Wednesday). Pancakes were a last indulgence of butter & eggs forbidden in Lent.
Q.What is Ash Wednesday
A.Ash Wednesday is the start of Lent and is so-called as churchgoers have a cross drawn on their foreheads in ash. It follows Shrove Tuesday (Pancake Day).