What are liturgical honours and privileges for the Patrons of categories of people? In the Motu Proprio E sancti Thomae Mori proclaiming Saint Thomas More Patron of statesmen and politicans Pope John Paul II. declares:


  Therefore, after due consideration and willingly acceding to the petitions addressed to me, I establish and declare Saint Thomas More the heavenly Patron of Statesmen and Politicians, and I decree that he be ascribed all the liturgical honours and privileges which, according to law, belong to the Patrons of categories of people. 


What are these liturgical honors and privileges? 

For groups and regions that can have a particular calendar it is just the liturgical memororial. Rules on this are in the Instruction of the Sacred Congregation for Divine Worship Calendaria  particularia (in Latin; AAS 62 [1970], 651-663). As a group like Politicans has no own particular calendar (and most time no own litrugical celebrations), I have no idea what kind of litrugical honors a Patron can be granted.

Clarification: After Ken's Answer I want to further explain my question.

The pope uses the term "liturgical honours and privileges which, according to law, belong to the Patrons of categories of people" like it is a clearly defined set of honours and privileges that apply to all "Patrons of categories of people". I want to know, if such a set exists and which privileges it includes. So a list of liturgical honors for certain Saints does not help me, even if they are also "Patrons of categories of people".

Such privileges could be: 


the use of the propium of the Saint's memorial on other days in masses of/for this group
some privileges in veneration for members of this group (e.g. if there were a ban on private possesion of Saints's image, an exception for this group)


Maybe the Red, Blue, ... Masses are such a privilege, but than I did not understand it. I have never heared before of this pracitice (Germany). If the Saint is mentioned in these masses, it may be one of the liturgical privileges I am searching for.
What are liturgical honours and privileges for patron saints?

The liturgical honours of each particular saint is that they each have a fixed day in which they may be particularly honoured at Mass or with a Mass in their honour in their feast days. Some saints have the special privilege of having a special blessing for something attached to them in the Rituale Roamanum, but not many. For example on the Feast of St. John the Evangelist there is a Blessing for Wine. This particular blessing is reserved and can only be used on St. John's Day (December 27). Not every saint has special liturgical honours!

More such examples are as follows:


A patron saint of a particular group or locality may have his or her name mentioned at Mass in the (Eucharistic Prayer III) on the feast day of that particular saint or at the occasion when one employs a Votive Mass of their patron saint. Please remember that we are dealing with honours and privileges that touch the liturgy.
Churches that are under the patronage of a particular saint have the liturgical privilege of celebrating his feast day as a solemnity, even if it falls on a Sunday. 
Principle Patronal saints of countries enjoy this same privilege. (St. joseph's Day (March 19) in Canada for example).
Principle Patron Saints of a particular diocese enjoy also this same privilege within it's jurisdiction.
His name will be inscribed into the Roman Martyrology and a date will be accorded for his commemoration in the Catholic Church. 


Here follows a few particular examples of some historical individual honours reserved to some saints by tradition:


St. Maurus’ Blessing of the Sick (January 15). The ancient formula may be found here on page 452. 
On the Eve of St. Anthony the Great (January 16) many European countries, notably Spain and Italy large bonfires are lite in St. Anthony's honour.  Priests may use the Blessing of Fire (Benedictio Ignis from the Rituale Romamanum)
Blessing of farm animals on the feast of St. Anthony (January 17). Vatican City still honours St. Anthony with the blessing of animals  on his feast day. 
There is a reserved blessing for throats on Feast of St. Blaise (February 3). The custom of blessing candles and/or throats on this saint’s feast day comes from the story of St. Blaise healing a young boy who had a fishbone stuck in his throat. The blessing of candles commemorates the actions of this young boy's mother, who used to bring St. Blaise candles while he was in prison.
There is a Blessing of a bonfire reserved for the Vigil of St. John the Baptist (June 23). Since the Vigil of St. John the Baptist was not an obligatory fast day, many places, especially in Europe, celebrated the feast of St. John the Baptist with huge bonfires, which could be lit anytime after the first vespers of the feast (on June 23). The vigil often coincides in proximity with the summer solstice and the Midsummer celebrations, thus making St. John's Eve one of the most celebrated nights in all of Europe.  Big bonfires are lit in Hungary, Croatia, Italy, France, Canada (especially in Québec), and in Spain, just to mention a few. St. John's bonfires are hugely popular in Spain. The Benedicti  Roji of the older formula can be found here on page 316.




Saint John's Fire with festivities in front of a Christian calvary shrine in Brittany, 1893


Blessing of Herbs is a prayer reserved for the Assumption of the Blessed Virgin Mary August 15).
Blessing of Seeds is a reserved prayer for the Nativity of the Blessed Virgin Mary (September 8).
Some dioceses have the privilege of certain blessings for particular saints of their region. The Blessing of Water, Salt and Bread in honour of St. Hubert is to be found in the Rituale Romanum (page 466) of Pope St. Pius V and is reserved to the  Archdiocese of Cologne for St. Hubert' Day (November 3). 
At one time, the Dominicans had the privilege of blessing water with a relic of St. Peter the Martyr on his feast day (April 6). The blessing can be found here on page 453.
The ancient formula of blessing wine in honour of St. John the Evangelist (December27) may be viewed here (Rituale Romanum of Pope Pius V) on page 312.


As for St. Thomas More the following may be of interest. St. Thomas More has the privilege of being the patron saint of all statement, politicians, lawyers and people in public life. Not many saints are personally proclaimed patron saints by the pope in a Motu Proprio. The vast majority are not. St Thomas is thus in the category of special few. Deo Gratias.

There is nothing stopping the Catholic faithful from saying a novena in honour of St. Thomas More or Catholic lawyers and judges from asking a 
priestly blessing on St. Thomas More Day (especially if a priest is in possession of a relic of St. Thomas).

St. Thomas Moore was an English lawyer, humanist, scholar, father of four children, and martyr. He was also Lord Chancellor from December 31, 1525 to November 3, 1532. He was beheaded on July 6, 1535, for refusing to take the Oath of Succession. He is jointly commemorated on June 22 with St. John Fisher. He is the patron saint of statesmen and politicians and thus of lawyer also.

Churches that are under the patronage of St. Thomas More have the liturgical privilege of celebrating his feast day as a solemnity, even if it falls on a Sunday. 

The Red Mass may be celebrated on the feast of St. Thomas More who the patron saint of lawyers. The votive Red Mass has no fixed day in which it may be celebrated, although most countries place it around the commencement of their judicial year. 


  The St. Thomas More Society of Los Angeles is an association of Catholic legal professionals. The society celebrates its namesake who has inspired lawyers of all faiths for generations and has selected St. Thomas More as patron of the Red Mass. - Red Mass


The Red Mass is simply a votive Mass in honour of the Holy Spirit for the intention of asking guidance from the Holy Spirit for all those involved in the justice system (judges, lawyers, advocates, doctors of law, law school professors, students and government officials). The phrase the Red Mass is two fold. Firstly, the liturgical colour of any Mass in Honour of the Holy Spirit is red and secondly the colour of the robe for judges of the High Courts (in many Countries) is also red. Doctors of the law also wore red robes.


  The Red Mass has a rich history. Beginning in England during the Middle Ages and continuing even through World War II, the entire bench and bar attended the Mass at the opening of the Court’s term.
  
  Liturgically, the Red Mass is celebrated as the Solemn Mass of the Holy Spirit. Its name derives from the traditional red color of the vestments worn by clergy during the Mass, representing the tongues of fire symbolizing the presence of the Holy Spirit. The Judges of the High Court, who were all doctors of the law, also wore red robes or academic hoods. With so many participants in red, the celebrations became irrevocably known as the Red Mass. The Red Mass historically marked the official opening of the judicial year of the Sacred Roman Rota, the Tribunal of the Holy See.
  
  In the United States, the Red Mass tradition was inaugurated on October 6, 1928, at old St. Andrew’s Church in New York City. Since then, the Red Mass has been celebrated throughout the United States each fall before the U.S. Supreme Court’s term begins. - The Red Mass


The first recorded Red Mass was held in Paris in 1245. In modern times each country has its own date in which to host the Red Mass if they choose to do so. Nevertheless each diocese or parish may hold its own Red Mass Day on any particular date that is liturgically free to do so. This is especially true if the parish church dedicated to St. Thomas More, patron saint of lawyers.

One of the better-known Red Masses in the USA is celebrated at the Cathedral of St. Matthew the Apostle in Washington D.C. Since the Supreme Court convenes on the first Monday of October, the Red Mass is celebrated on the Sunday before the first Monday of October. It is normally presided over by a cardinal.

In Ireland, the Red Mass is celebrated on the first Monday of October, which is the opening day of the Michaelmas Law Term.


  In Canada, the Red Mass was first celebrated in Québec City in 1896, in Toronto in 1924 and in Montréal in 1944. Its sponsorship was assumed by the Guild of Our Lady of Good Counsel in 1931 and by The Thomas More Lawyers' Guild of Toronto since 1968. It was re-instituted in Sydney, Australia in 1931. - Red Mass (Wikipedia)


More sources can be viewed as following:

St. Thomas More Society Red Mass

Welcome to the St. Thomas More Society of Los Angeles

History of red mass

Holy Spirit, guide us in all our ways.

St. Thomas More, pray for us.

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