Holy Days
The Church of God, International does not observe most of the holidays that Protestants and Catholics keep.  You can search your Bible and not find Christians keeping Christmas, Easter, Halloween, etc.  However, the Almighty hasn't left mankind without days to celebrate.  In addition to the weekly Sabbaths, God commands His people to observe eight other days each year.  Because the holy days are reckoned by the lunar calendar, they don't occur on exactly the same day, or sometimes even in the same month every year.
Roman Year 2006:
April 12*               New Testament Passover
April 13-19            Feast of Unleavened Bread
June 4                   Feast of Pentecost
September 23         Feast of Trumpets
October 2              Day of Atonement
October 7-13         Feast of Tabernacles
October 14th         Last Great Day

* observed the previous evening
Roman Year 2007:
April 2*                              New Testament Passover
April 3-9                             Feast of Unleavened Bread
May 27                               Feast of Pentecost
September 13                      Feast of Trumpets
September 22                      Day of Atonement
September 27 - October 3    Feast of Tabernacles
October 4                           Last Great Day

* observed the previous evening
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