The basic principle of Christianity is that God exists. As humans, it is impossible to understand the totality of what this means. However, it doesn’t prevent us from pursuing the knowledge needed to increase our awareness level while pondering His existence. To help with your spiritual journey, here is a road map – The Christian Calendar:

Date Event Description
January 6th Epiphany A manifestation of a divine or supernatural being. It is the festival commemorating the Epiphany on January 6th.
March 1st Ash Wednesday The first day of lent in the Western Christian church, marked by service of penitence.
April 9th Palm Sunday The Sunday before Easter, when the triumphal entry of Jesus into Jerusalem is celebrated in Christian churches by processions in which palm fronds are carried.
April 13th Maundy Thursday The Thursday before Easter, observed in the Christian Church as a commemoration of the Last Supper.
April 15th Holy Saturday Holy Saturday commemorates the day that Jesus Christ lay in the tomb after his death, according to the Christian bible. It is the day after Good Friday and the day before Easter Sunday. It is also known as Easter Eve, Easter Even, Black Saturday, or the Saturday before Easter.
April 16th Easter Sunday Easter, also called Resurrection Sunday, is a festival and holiday celebrating the resurrection of Jesus from the dead, described in the New Testament as having occurred on the third day of his burial after his crucifixion.
April 17th Easter Monday Easter Monday is the day after Easter Sunday and is a holiday in some countries. It marks the beginning of Easter week and is also known as Bright Monday, Renewal Monday, and Wet Monday.
May 25th Ascension Day Ascension Day is the 40th day of Easter. It occurs 39 days after Easter Sunday. It is a Christian holiday that commemorates Jesus Christ’s ascension into heaven according to Christian belief. Ascension Day marks the 40th day after Jesus Christ’s resurrection according to Christian belief (www.timeanddate.com).
June 4th Pentecost Day It is the tenth day after Ascension Thursday and “fiftieth Day” since the Passover. It refers to the occasion of the descent of the Holy Spirit upon the Apostles and other followers of Jesus Christ.
June 5th Whit Monday Whit Monday also known as Pentecost Monday or Monday of the Holy Spirit. It is the holiday that celebrates the day after Pentecost.
June 11th Trinity Sunday The next Sunday after Pentecost which is observed as a feast in honor of the Holy Trinity.
June 15th Corpus Christi Corpus Christi is Latin for the Body of Christ. It is the Thursday after Trinity and is observed as a festival in honor of the Eucharist.
August 15th Assumption of Mary Assumption of Mary also Known as Falling Asleep of the Blessed Virgin Mary, which is a celebration in the Roman Catholic Church of the Virgin’s Mary’s being taken up into heaven when her earthly life ended.
September 8th Feast of the Nativity of Mary The Nativity of the Blessed Virgin Mary, also known as the Nativity of Mary, or the Birth of the Virgin Mary. It is feast day celebrating the birth of the Blessed Virgin Mary.
October 4th Feast of Saint Francis of Assisi The feast commemorates the life of St Francis, who was born in the 12th century and is the Catholic Church’s patron saint of animals and the environment.
November 1st All Saint’s Day A Christian festival in honor of all the saints. .
November 2nd All Soul’s Day A time when some Christian churches pray for the souls of the dead.
December 3rd First Sunday of Advent Advent Sunday, also known as First Sunday of Advent, is the first day of the liturgical year and the start of the season of Advent.
December 8th Feast of the Immaculate Conception It celebrates the solemn belief in the Immaculate Conception of the Blessed Virgin Mary.
December 24th Christmas Eve The day before Christmas Day.
December 25th Christmas Day The annual festival celebrating Christ’s birth

References: https://www.timeanddate.com/holidays/us/; https://en.wikipedia.org/wiki; www.google.com

Happy Spiritual journey!