How Are Readings Organized In A Catholic Church?

THE LITURGICAL YEAR/CALENDAR
5. The Liturgical Calendar begins every year during the month of November on the First Sunday of Advent and runs through to the Solemnity of Christ the King.
6. The liturgical year is the temporal structure within which the Church celebrates the holy mysteries of Christ: “From the Incarnation and the Nativity to the Ascension, to Pentecost and to the wait in joyful hope for the Lord’s coming”.
7. “During the liturgical year, ‘the celebration of the Paschal Mystery [...] is the most privileged moment in the daily, weekly and annual celebration of Christian worship’. Consequently, the priority of the Liturgical year over any other devotional form or practice must be regarded as a touch stone for the relationship between Liturgy and popular piety.” (# 94, Directory of Popular Piety and the Liturgy; Principles and Guidelines; Vatican City, December, 2001)
8. The Liturgical Calendar is a tool that kindles the hearts of Catholics so that they will remember God’s marvellous plan of salvation that was accomplished through the birth, life, death and rising of Christ Who once again walks the earth in our time and presence.
THE LITURGICAL CYCLES
9. The “Lectionary,” the Mass readings from the Holy Bible, follows a Sunday cycle and a weekday cycle. The Liturgical Calendar follows a three year cycle, each year being represented by the letters, A, B and C.
10. During the year A cycle, the Gospel of Matthew is the primary Gospel that is used for the readings. In year B, Mark is the primary Gospel. In year C Luke is the primary Gospel. The Gospel of John is proclaimed on particular Sundays in each of the years.
11. On weekdays in Ordinary Time, there is a 2 year cycle numbered I and II. Year I is read in odd number years such as 2005, 2007, 2009. Year II is read in even years such as 2006, 2008, 2010.
12. It should be noted that if a person attends the Holy Mass everyday for 3 years, having been present for all the readings of the 3 cycles, most of the Holy Bible will have been read to him during that time frame.
THE SEASONS OF THE LITURGICAL CALENDAR
13. In each cycle of the Liturgical Calendar, you will find six Seasons:
(1) Advent,
(2) Christmas,
(3) Lent,
(4) Triduum,
(5) Easter, and
(6) Ordinary Time.
14. During the year, in addition to the Sunday worship, the Church also celebrates Solemnities, Feasts, and Memorials which may be on any day of the week. These occur during the year to commemorate special events or persons that are highly revered by the Catholic Church.
THE UNIVERSAL LITURGICAL CALENDAR
15. The entire Church is required to follow the approved Universal Liturgical Calendar. The Universal Calendar originated from the Congregation of the Liturgy at the Vatican. It contains monthly guides that must be followed by all the faithful.

The lectionary lays out the daily lessons from the Old and New Testament. The lectionary (which is shared between many denominations, not just Roman Catholics) operates on a three-year cycle, so that within a three-year period the entire of the Bible (with a few exceptions!) is read in churches. There are various national and international bodies, like the US Conference of Catholic Bishops, which supervise and publish the ordained lectionary readings for any given year.

The readings (liturgy) are planned by both the Vatican and the USCCB. They are layed out in the missle and the first and second readings on Sunday are usually from the old testament, then their is a psalm and finally the Gospel. The Homily ties them all together with what is appropriate and helpful to the congregation at the time. God Bless…

They are sent the info on their blackberry’s, computer, etc…..
The same readings are done at all the churches, just the homilys may be a little different.

http://en.wikipedia.org/wiki/Lectionary