There are basically two reasons:
Holy Week is the most solemn time during the year when we commemorate the passion and death of Our Lord. It is not a time for a celebration, such as a wedding. Also, the church building is used for a number of Holy Week rites and services and scheduling would be difficult.
The church of God first experience the outpouring of the Holy Ghost was happened during the Pentecost.
They supplied priests that would take in children and make them holy through the use of molestation.
A common problem in feudal society that the Church tried to stop during holy days and seasons were private wars among the nobles.
they would dunk there heads in a holy river or they would do it in a church.......
As the Catholic Church is the Mystical Body of Christ, and is led and guided by the Holy Spirit, I would say that any attempt to change the Church would be futile, unless you were talking about something superficial or a change that the Holy Spirit was leading it in.
yes
Church of the Holy Rude was created in 1129.
Church of the Holy Ascension was created in 1826.
Holy Trinity Church Marylebone was created in 1828.
Holy Communion/Mass/Eucharist
The Catholic Church hoped that the Crusades would help to reclaim Jerusalem and other holy sites in the Holy Land from Muslim control, as well as unite Christians under a common cause and strengthen the Church's authority.