Q. 1. What is Sexagesima Sunday? I never heard of this Sunday before.

A. 1. According to wikipedia, Sexagesima Sunday is the name for the eight Sunday before Easter, the second before Ash Wednesday in the Gregorian Rite liturgical calendar of the Roman Catholic Church.

There is more to the matter which is not mentioned on the internet. The word Sexagesima means sixty. According to the First Council of Orleans, in the year A.D. 545, many pious ecclesiastics and lay persons of the primitive Church used to fast sixty days before Easter, and their fast was called, therefore, Sexagesima, a name which was afterwards retained to distinguish this Sunday from others.