John the Baptiser has his birth feast day six months prior to Christmas eve, on June 24. This celebration is one of the oldest, if not the oldest commemorating a saint. The celebration of the Beheading of St. John the Baptist, August 29, is nearly as old as his nativity.
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Several Florida churches said they are celebrating the Jewish holiday Passover with Seders reorganized with a Christian spin.
http://www.upi.com/Odd_News/2010/03/29/Fla-Christians-celebrate-Passover/UPI-29491269891482/
( The Passover Plot---God's Intelligently Designed Mass Murder: http://dwindlinginunbelief.blogspot.com/2008/04/how-could-anyone-celebrate-passover.html )
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Why is the day of crucifixion called "Good"? Good Friday
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Why do christians celebrate the gory murder of Jesus by pretending to drink his blood and eat his body?
....in their own words it is called a "celebration":
Because the celebration of the Eucharist introduces us to the "final day" (eschata), the Lord's Day is also known as the "eighth day," http://goarch.org/ourfaith/ourfaith7118