Pentecost is a celebration of the descent of the Holy Spirit on Jesus’ disciples, and the birth of the church, following His resurrection.
Pentecost is a celebration of the descent of the Holy Spirit on Jesus’ disciples, and the birth of the church, following His resurrection. Pentecost always occurs seven weeks after Easter Sunday and is typically celebrated with baptism liturgies and joyous services.
http://www.newadvent.org/cathen/15614b.htm