What is Pentecost?     
Pentecost is the great festival that marks the birth of the Christian church by the power of the Holy Spirit.  Pentecost means "fiftieth day" and is celebrated fifty days after.

Why is Pentecost sometimes called "WhitSunday"?     
A tradition of some churches in ancient times was to baptize adult converts to the faith on Pentecost.  The newly baptized catechumens would wear white robes on that day, so Pentecost was often called "Whitsunday" or "White Sunday" after these white baptismal garments.  Many Christian calendars, liturgies, and hymnals (particularly those from the Episcopal/Anglican tradition) still use this term.  An appropriate day for First Communion and Confirmation in the life of the church.

What is the liturgical colour for Pentecost?      
Red is the liturgical colour for this day.  Red recalls the tongues of flame in which the Holy Spirit descended on the first Pentecost.  The colour red also reminds us of the blood of the martyrs.  These are the believers of every generation who by the power of the Holy Spirit hold firm to the true faith even at the cost of their lives.