Wikimedia Commons has media related to Roman Catholic holy days.

Advent	Sundays 1st 2nd 3rd 4th Immaculate Conception December 17 to 23
Christmas Season	Christmas Midnight Mass Holy Family Mary, Mother of God Epiphany Baptism of the Lord
Ordinary Time	Presentation of the Lord
Lent	Ash Wednesday Sundays 1st 2nd 3rd 4th 5th Saint Joseph Annunciation Palm Sunday Holy Week
Paschal Triduum	Holy Thursday Chrism Mass Mass of the Lord's Supper Good Friday Holy Saturday Easter Vigil
Easter Season	Easter Sunday Octave Sundays 2nd Divine Mercy Sunday 3rd 4th 5th 6th 7th Ascension Pentecost
Ordinary Time	Trinity Sunday Corpus Christi Sacred Heart Visitation Nativity of John the Baptist Saints Peter and Paul Transfiguration Assumption Nativity of Mary Exaltation of the Cross All Saints' Day All Souls' Day Presentation of Mary Christ the King

Pre-Lent	Septuagesima Sexagesima Quinquagesima
Lent	Ash Wednesday Sundays 1st 2nd 3rd 4th Spring Ember Days Saint Joseph Annunciation
Passiontide	Passion Sunday Palm Sunday^P Holy Week^P