Pentecost commemorates when Jesus sent the Holy Spirit to be with the disciples (Acts 2). With the Holy Spirit among the disciples, the church was born.
Pentecost is a Christian festival that celebrates the gift of the Holy Spirit. It takes place on the Sunday 50 days after Easter. The festival is generally full of good spirits. Ministers will wear red robes as a symbol of the flames in which the Holy Spirit came to earth. The Holy Spirit is the third part of the Trinity (Father, Son and Holy Spirit), which Christians use as a way to interpret God. The Holy Spirit is often depicted as wind or a dove in the Bible.
In essence, Pentecost is the birthday of the Christian faith. We will celebrate this day on May 20th this year.