Pentecost comes on June 4 this year (2017). The date is set for 50 days after Passover. Within the Jewish cycle of festivals, Pentecost celebrated the first harvest.
Pentecost is the old Greek and Latin name for the Jewish Festival of Weeks which can be found in Exodus 34:22 and Deuteronomy 16:10. It is also called the Festival of Reaping in Exodus 23:16, and Day of the First Fruits in Numbers 28:26.
Jews traditionally read the Book of Ruth at Pentecost, as the story links with the grain harvest theme of the festival.
Another Jewish Pentecost tradition commemorates God’s giving of the Ten Commandments at Mount Sinai, 49 days after the Exodus.
As we continue to read across the centuries of our Scriptures, we see again and again how interwoven The Story is.
Charlotte’s Living in The Story blog for Pentecost
https://livinginthestory.com/2015/03/pentecost-people/
Living in The Story blog for Week 21
https://livinginthestory.com/2015/04/the-cosmic-cornerstone/
Some information here was gleaned from https://en.wikipedia.org/wiki/Pentecost