Epiphany celebrates the arrival of the Magi.
The Epiphany is celebrated on January 6. It is a Christian feast day that celebrates the revelation of God the Son as a human being in Jesus. In Western Christianity, the visit of the Magi to the baby Jesus mainly, but not solely, commemorated.
The Catholic Church celebrates John the Apostle's feast day on December 27. The Eastern Orthodox Church celebrates it on September 26.
Holy Thursday celebrates the institution of the Eucharist.
The Christian Bible has the story of the Magi attending the birth of Jesus, but I don't think any of the Christian denominations "celebrate" that event, other than possibly showing the three kings in a Christmas pageant.
John the Baptist
The Roman Catholic Church celebrates the feast day of St. Richard of Chichester on 3rd April.
A number of saints share December 26 as a feast day but the best known is Saint Stephen, Deacon and Martyr.
The day Jesus was born or what we call Christmas
Because that was the day that the pilgrims and the Indians had their big feast
The Feast the Church celebrates as the day on which the angel Gabriel appeared to Mary is the Feast of the Annunciation. It falls on March 25 for the year of 2014.
The Latin Church celebrates the feast of St. Matthew on 21 September, and the Greek Church on 16 November.
There are hundreds of saints with June feast days. St. Anthony of Padua (June 13) is just one of them.