Easter day
Origin:
Modern-day Easter is derived from two ancient traditions: one Judeo-Christian and the other Pagan. Both Christians and Pagans have celebrated death and resurrection themes following the Spring Equinox for millennia. Most religious historians believe that many elements of the Christian observance of Easter were derived from earlier Pagan celebrations.The equinox occurs each year on March 20, 21 or 22. Both Neopagans and Christians continue to celebrate religious rituals linked to the equinox in the present day.Wiccans and other Neopagans usually hold their celebrations on the day or eve of the equinox. Western Christians wait until the Sunday on or after the next full moon. The Eastern Orthodox churches follow a different calculation; their celebration is often many weeks after the date selected by the Western churches.

2 different origin of Easter day for 2 different religion:
Pagan origin of Easter: Many, perhaps most, Pagan religions in the Mediterranean area had a major seasonal day of religious celebration at or following the Spring Equinox. Cybele, the Phrygian fertility goddess, had a fictional consort who was believed to have been born via a virgin birth. He was Attis, who was believed to have died and been resurrected each year during the period March 22 to March 25. "About 200 B.C. mystery cults began to appear in Rome just as they had earlier in Greece. Most notable was the Cybele cult centered on Vatican hill ...Associated with the Cybele cult was that of her lover, Attis (the older Tammuz, Osiris, Dionysus, or Orpheus under a new name). He was a god of ever-reviving vegetation. Born of a virgin, he died and was reborn annually. The festival began as a day of blood on Black Friday and culminated after three days in a day of rejoicing over the resurrection."

Christian origin of Easter:
A very common theme present in many ancient Pagan religions described the life of a man-god -- a savior of humanity -- his execution, his visit to the underworld, his resurrection after two or three days, and his ascension to heaven. The life of Yeshua of Nazareth (a.k.a. Jesus Christ) as recorded in the Gospels includes the Christian version of this theme. Good Friday is observed in remembrance of Jesus' execution by the occupying Roman army, and his burial in a cave-tomb. Easter Sunday is the date when a group of his female followers first noticed the empty tomb, and concluded that he had either been resurrected, or his body had been stolen.

Traditions
White Vestments and Linens Ringing Bells in Celebration Baptizing
New Converts Lighting of the Paschal Candle
Having Lamb for Easter dinner
Symbols
Lambs (Christ as lamb)
Lily (symbolizes the resurrection)
Colored Eggs
Empty Crosses
Old Testament Typology Foreshadowing the Resurrection
Samson Carrying Off the Gates of Gaza
Daniel Coming Forth from the Lion's Den
The Three Youths Emerging from the Furnace
Jonah Coming Forth From the Whale

How to celebrate Easter: Attend an Easter vigil, when baptisms take place, Alleluias are said for the first time since the beginning of Lent and the Paschal candle is lit. Decorate your home and church in white and gold, the colors of Easter. Wear new clothes to represent a new beginning, especially an Easter bonnet. Hide decorated Easter eggs for children to find, to represent coming out of the womb/tomb (i.e., Easter's intertwined themes of fertility and resurrection). Take part in an Easter egg roll. The White House first hosted one during the administration of Rutherford B. Hayes.