The Catholic Encyclopedia describes the archeology of liturgy as follows:
At Athens the leitourgia was the public service performed by the wealthier citizens at their own expense, such as the office of gymnasiarch, who superintended the gymnasium, that of choregus, who paid the singers of a chorus in the theatre, that of the hestiator, who gave a banquet to his tribe, of the trierarchus, who provided a warship for the state. The meaning of the word liturgy is then extended to cover any general service of a public kind. In the Septuagint it (and the verb leitourgeo) is used for the public service of the temple (e.g., Exodus 38:27; 39:12, etc.). Thence it comes to have a religious sense as the function of the priests, the ritual service of the temple (e.g., Joel 1:9, 2:17, etc.). In the New Testament this religious meaning has become definitely established. In Luke 1:23, Zachary goes home when "the days of his liturgy" (ai hemerai tes leitourgias autou) are over. In Hebrews 8:6, the high priest of the New Law "has obtained a better liturgy", that is a better kind of public religious service than that of the Temple.
So in Christian use liturgy meant the public official service of the Church, that corresponded to the official service of the Temple in the Old Law.(1)
The liturgy of the New Law is primarily indicative of the Celebration of the Eucharist (called the Sacrifice of the Mass in the Roman Rite, and the Divine Liturgy in the Eastern Rites). There are several important aspects of this perfect and sacred Liturgy: It has four ends, viz. adoration, thanksgiving, propitiation, and petition; all members of the Church participate in it, though only the Priest alone is its minister; and the Eucharist, as Pope St. Paul VI says, "contains the entire spiritual boon of the Church, that is, Christ Himself, our Pasch and Living Bread, by the action of the Holy Spirit through His very flesh vital and vitalizing, giving life to men who are thus invited and encouraged to offer themselves, their labors and all created things, together with Him."(2)
With the Sacred Liturgy as the perfect model, we can define liturgy in general according to certain essential characteristics: It is a ritual, performed on behalf of a community, which is at once the expression of a common good of that community, and is a common good itself. These characteristics are entirely possible to achieve on a natural level, in what I shall term 'civic liturgy'.
So, setting aside the supernatural economy of grace made known in the revelation of Divine Law, what does civic liturgy look like?
We have examples of civic liturgy from the world and from history. The simplest and most common is the parade: Its purpose is usually to commemorate some event, honor a holiday, or to celebrate a personal achievement that has redounded to the benefit of the community (e.g. the Roman Triumph). In any event, a parade is always held for a reason, and that reason often assumes the parade itself: The anniversary of a nation's founding, for instance, is established as a commemorative festival; the parade commemorates the event, and becomes a part of the event. Parades also follow a set ritual, albeit a very simple one; the members of a parade march or process down a public avenue. Moreover, parades are held for the community, though not every member of the community is a part of the parade; yet it would be absurd to hold a parade without a spectating public. Hence, there is common participation, though relatively few liturgical "ministers."
The distinction between participant and minister is more drastic in liturgies wherein one assumes public office. The most extravagant and fitting example is the coronation, though any ritual in which a citizen is sworn into office is certainly liturgical. The ritual aspect is essential to these events. Precise actions must be performed for the purpose of the liturgy to be consummated: A hand is raised, words are recited, a crown is donned, etc. It is obvious that these rituals are performed for the good of the community. By such a ritual, a leader is appointed and the ritual is the appointment: The common good is expressed through the ritual, and the common good contains the ritual. Moreover, the entire community participates in this ritual insofar as they are implicated in it: Their leader is appointed, and the order of the community in which they share is continued.
A third example of civic liturgy is the award ceremony; usually academic, military, or occupational. Such ceremonies celebrate the achievement of an individual insofar as it has served the common good of his community (e.g. a medal of merit or Nobel prize), or has elevated the mode by which he participates in the community (e.g. a school graduation or military promotion).
Is civic liturgy needed under the reign of Christ? All of the above examples, and indeed any civic liturgy that is originally secular are, simply put, celebrations of the highest natural goods. As such, they are good in their own right; they affirm a good to which we are ordered by nature and which we receive ultimately from God, Who is the source of all good. Civic liturgy, then, is not competitive with Christian liturgy, because it belongs to a different "tier," as it were. Even so, any civic, secular liturgy can be "baptized," and history provides us with countless examples of Christianized civic liturgies.
Unfortunately, the popular sense and understanding of liturgy is weak. Just as the Divine Liturgy is mocked by "neo-pagan" or satanic "masses" which invert the purpose and significance of sacred liturgy, there are perversions of civic liturgies which express not the common good of the community, but its affliction and fragmentation. Examples of such perversions can be seen in "pride parades," which are more like a foreign army's show of force in a conquered city than they are a common celebration of a shared good (albeit even a conquering army expresses a good that is intrinsic to its own community, despite offense to the native public), and certain awards ceremonies (such as the Academy of Motion Pictures Awards) which are focused on individual achievements specifically to the exclusion of others.
Nevertheless, the proliferation of (good) liturgical practice can increase the goods which those liturgies express. Just as a healthy body rejoices in its health by engaging in physical activities which in turn contribute to its good health, so too is a healthy community replete with ritual expressions which spur its members to participate more fully in their community.
(1) Fortescue, Adrian. "Liturgy." The Catholic Encyclopedia. Vol. 9. New York: Robert Appleton Company, 1910. 5 Sept. 2020 <http://www.newadvent.org/cathen/09306a.htm>.
(2) Presbyterorum Ordinis, 5.
