Easter Sunday is a holiday that celebrated by many Christians every year.
Unlike Christmas, which has a generally accepted assigned day, the date on the which the Spring holiday falls is calculated. Simply, the calculation (also known as Computus) is for the Sunday after the full moon, on or after the Spring Equinox. Accordingly, Easter can fall on 35 possible dates - between March 22 and April 25, inclusive.
Because the Easter Sunday is a movable feast, Mardi Gras (pseud., Shrove Tuesday), at the front end, also has variable date. At the back end, the Sunday that follows Easter is called "low Sunday" or quasimodo.
Quasimodo was also one of the main characters in Victor Hugo's "Notre-Dame de Paris". Also known as the Hunchback of Notre Dame, he was, no only deformed, but deaf as a result of ringing the Cathedral bells. I often wondered if Quasimodo suffered from Tinnitus.