In the Catholic Church, what are normally called "feast days" are divided into Solemnities, Feasts, and Memorials. Attached below the Answer is the complete calendar for this year. Solemnities include Easter, Christmas, Epiphany, Ascension, and Pentecost, the Sundays of Advent, Lent, and the season of Easter; Ash Wednesday, the weekdays of Holy Week, Days within the octave of Easter, etc. Feasts include Feasts of the Lord in the general calendar, Sundays of the Christmas season and Sundays in ordinary time, Feasts of the Blessed Virgin Mary and of the saints in the general calendar, Proper Feasts, namely: Feast of the principal patron of the diocese, anniversary of the dedication of the cathedral, principal patron of the territory, province, country, or more extensive territory, Feast of the titular saint, founder, or principal patron of an order, congregation, or religious province. Other feasts, then weekdays of Advent from December 17 to December 24 inclusive, days with the Octave of Christmas, weekdays of Lent. Everything else is considered a memorial.
Listing ALL the feast days will take forever, especially when you consider how many hundreds of saints there are and that they have feast days. Chances are there is a feast day everyday of the year, some are more well known and widely celebrated than others.
The three most important feast days in the Catholic Church - in order, top to bottom, are:
1.) Pentecost Sunday - the birthday of the Church.
2.) Easter Sunday - the Resurrection of Our Lord
3.) The Nativity of Our Lord - Christmas
The feast of Saints Peter and Paul - June 29.
June 29 - the feast of Saints Peter and Paul
Saints Peter and Paul - June 29.
The Solemnity of Saint Peter and Saint Paul
Saints Peter and Paul - June 29.
Saint John of God's feast day is celebrated on March 8th on the liturgical calendar of the Universal Church.
The feast of St. Denis is on October 9 throughout the Universal Church.
Santo Niño is Spanish for 'Holy Child' and refers to the Christ Child. Christmas would be the universal celebration of the Christ Child. However, there are some local celebrations, such as in some towns in the Philippines, that celebrate a separate feast after Epiphany but these are not observed by the Universal Church.
April 16 is the feast day celebrated by the Universal Church and commemorates the day she died.February 18 is celebrated in France only and commemorates the date Bernadette received her first vision.
The Solemnity of Saint Peter and Saint Paul
August 18 in the Catholic Church is the feast day of Saint Helena.
Constantine is not recognized as a saint in the Catholic Church so has no feast day. He is recognized as a saint in the Orthodox Church, however.