Formerly, the post-Easter festivities involved a week of secular celebration, but this was reduced to one day in the 19th century. Events include egg rolling competitions and, in predominantly Catholic countries, dousing other people with water which, at one time, had been holy water blessed the day before at Easter Sunday Mass and carried home to bless the house and food.
Easter Monday on the Catholic liturgical calendar is the second day of the octave of Easter Week.
In the Eastern Orthodox Church, Easter Monday is called Bright Monday.