The Day of Pentecost is celebrated exactly 50 days after Passover, or seven weeks after Easter. The Pentecost Season is the longest season of the church year, lasting the entire second half of the church year until the first Sunday of Advent.
In the Christian church year, Pentecost celebrates the day the Holy Spirit was given to the followers of Jesus, so that they had the power and courage to preach the good news (see Luke 24:48-49; Acts 2). This is why Pentecost is sometimes called the birthday of the Christian church.
The color of the Day of Pentecost is RED for the fire of the Holy Spirit and for the blood of brave Christians who gave their lives because of their faith. The color of the Season of Pentecost is green for growth.