Pentecost is considered to be the “birthday” of the Church. It commemorates the descent of the Holy Spirit upon the disciples of Jesus Christ, 50 days after Easter.  They were able to speak in multiple languages thus enabling them to expand the membership in the church to Jews from other parts of the world and eventually to non-Jewish people. It is also known as Whitsunday, or Whit Sunday because it is the traditional day for baptism in many countries.  Those who were to be baptized wore white.  The families celebrate with the newly baptized through family gatherings.  In other countries like Poland,  the people decorate their houses with green branches. This was to bring blessings to the home and the people living in it.