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783 B
Pentecost
"Pentecost" means "fiftieth (day)." You could use the word "Pentecost" in your translation and let the text explain the meaning. Or you could use a term that means, "50th day."
celebrated the wheat harvest
The Jews would thank God for the wheat harvest by bringing offerings and celebrate by having special meals. Wheat is a grain crop; if you have no word that means "wheat," you can use a more general word for grain. This happened in May; other crops were harvested at other times of the year.
This year
That is, "In the year that Jesus died."