In both Roman Catholic and Eastern Orthodox practice, today is the Feast of the Cross. Other of the older churches also celebrate it. It is also called Roodmas and Holy Rood Day...
Feast of the Cross - Wikipedia, the free encyclopedia:This feast is called in Greek Ὕψωσις τοῦ Τιμίου Σταυροῦ (literally, "Raising Aloft of the Precious Cross"). In Latin it is called Exaltatio Sanctae Crucis (literally, "Raising Aloft of the Holy Cross". (The word "Exaltatio" is sometimes Anglicized as "Exaltation", at other times, as in the 1973 ICEL translation, as "Triumph".) In some parts of the Anglican Communion the feast is called Holy Cross Day, a name also used by Lutherans.
The feast commemorates the finding of the True Cross in 326 by Saint Helena, the mother of the Roman Emperor Constantine I (venerated in the Eastern Church as Saint Constantine) during a pilgrimage she made to Jerusalem. The Church of the Holy Sepulchre was then built at the site of the discovery, by order of Helena and Constantine. The church was dedicated nine years later, with a portion of the cross placed inside it. In 614, that portion of the cross was carried away from the church by the Persians, and remained missing until it was recaptured by the Byzantine Emperor Heraclius in 628. The cross was returned to the church the following year after initially having been taken to Constantinople by Heraclius.
The date used for the feast marks the dedication of the Church of the Holy Sepulchre in 335. This was a two-day festival: although the actual consecration of the church was on September 13, the cross itself was brought outside the church on September 14 so that the clergy and faithful could pray before the True Cross, and all could come forward to venerate it.
Western practices
In Roman Catholic liturgical observance, red vestments are worn at church services conducted on this day, and if the day falls on a Sunday, its Mass is used instead of that for the occurring Sunday in Ordinary Time, what some would call a Sunday after Pentecost.
Until 1969, the Wednesday, Friday and Saturday of the calendar week after the one in which 14 September falls were designated as one of each year's four sets of Ember days by the Church in the West. The organization of celebrations of this kind is now left up to the decision of Episcopal Conferences in view of local conditions and customs.
September 14 is the titular feast of the Congregation of Holy Cross and the Episcopal Church's Order of the Holy Cross. This date also marks the beginning of the period of fasting, stipulated in the Rule of St. Albert to be followed by the religious of the Carmelite spiritual family, and ending Easter Sunday.
Eastern practices
In Eastern Orthodox and Byzantine Catholic practice, the Universal Exaltation of the Precious and Life-creating Cross commemorates both the finding of the True Cross in 326 and its recovery from the Persians in 628, and is considered to be one of the Great Feasts of the church year. September 14 is always a fast day, even if it falls on Saturday or Sunday, and the eating of meat, dairy products and fish is prohibited. The Feast of the Exaltation has a one-day Forefeast and an eight-day Afterfeast. The Saturday and Sunday before and after September 14 are also commemorated with special Epistle and Gospel readings about the Cross at the Divine Liturgy.
During the All-Night Vigil on the Eve of the Feast, a cross is placed on the Holy Table (altar) where it reposes during the Vigil. The cross is placed on a tray that has been covered with an Aër (liturgical veil) and decorated with fresh basil leaves and flowers, and a candle burns before it. The cross reposes on the "High Place" of the Holy Table, where the Gospel Book normally lies. Those portions of the Vigil which would normally take place before the Icon of the Feast (the chanting of the Polyeleos and the Matins Gospel) instead take place in front of the Holy Table.
One of the high points of the celebration is when, after the Great Doxology, the priest or bishop brings the Cross out of the sanctuary. He sets the cross on a table (tetrapod or analogion) in the center of the temple (nave of the church) as the choir sings of the festal Troparion of the Cross: "Save, O Lord, Thy people, and bless Thine inheritance, granting unto Orthodox Christians [sometimes translated as "Christians of the true faith"] victory over enemies, and by the power of Thy Cross, do Thou preserve Thy commonwealth."
In cathedrals and monasteries, a special "Exaltation" is performed by the bishop or abbot, standing in the center of the church. This consists of his taking the cross in his hands and raising it above his head. He makes an exclamation, to which the choir responds, chanting, Kyrie eleison ("Lord, have mercy") 100 times. As they chant, he makes the sign of the cross with it three times, then slowly bows down to the ground, and stands up again raising the cross above his head as before. This process is repeated four more times to the four points of the compass.
Then, whether the special Exaltation has been performed or not, the clergy and the members of the congregation prostrate themselves on the ground as all sing, "Before Thy Cross, we bow down in worship, O Master, and Thy holy Resurrection we glorify" three times (at the words "Thy holy Resurrection" all stand up again). Then all come forward to venerate the cross and receive the priest's blessing (see Veneration of the Cross, below). During the veneration, stichera attributed to the Emperor Leo are chanted by the choir.
The cross will remain in the center of the temple throughout the Afterfeast, and the faithful will venerate it whenever they enter or leave the church. Finally, on the Apodosis of the Feast, the priest and deacon will cense around the cross, there will be a final veneration of the cross, and then they will solemnly bring the cross back into the sanctuary through the Holy Doors. This same pattern of bringing out the cross, veneration, and returning the cross at the end of the celebration is repeated at a number of the lesser Feasts of the Cross mentioned below.
Armenian Apostolic Church
The Armenian Apostolic Church observes a five-day fast, called the Fast of the Holy Cross from September 10 through September 14, in preparation for the Feast of the Holy Church in view of the Holy Cross, which they celebrate on September 15. September 16 is observed as the Feast of the Exaltation of the Holy Cross (Khachverats in Armenian), a feast which continues for several days thereafter. It is counted as one of the five major feasts of the Armenian Church, and the most important of the four feasts of the Holy Cross. According to Armenian tradition, the first one to "exalt" the Cross was the Apostle James of Jerusalem, the "Brother of the Lord". On the Sunday nearest 14 September, the liturgy is marked with an antasdan service (blessing of the fields) during which the processional cross is adorned with basil (a symbol of royalty) and the four corners of the church are blessed as a sign of the sanctification of the world.
On the Sunday nearest September 28 (always two weeks after the Exaltation) the Armenian Church celebrates the Feast of the Holy Cross of Varak (Varaka Khach) commemorating the 3rd century placement of an authentic relic of the cross in Armenian soil. This is a cross feast unique to the Armenian Church.
On the Sunday closest to October 26, the Armenian Church celebrates the Discovery of the Holy Cross (Kyood Khach), commemorating the finding of the True Cross by Saint Helena (327 AD).
Ethiopian Orthodox Tewahedo Church
The Ethiopian Orthodox Tewahedo Church, one of Oriental Orthodox Churches, comemorates the finding of the true cross on Meskerem 17 of the Ethiopian Calendar, corresponding to September 14 in the Julian Calendar (at present September 27 in the Gregorian Calendar) or, in leap years, one day later. The day is popularly called "Demera" in Amharic - meaning Bonfire. The Patriarch of the Ethiopian Orthodox Tewahedo Church lights a large bonfire in Maskal Square, Addis Ababa's greatest open arena, and smaller bonfires are lit by individuals throughout the country. Thousands attend the colourful and vibrant ceremony of religious chantings around the bonfire in Maskal Square, which owes its name to the ceremony, since the word "maskal" means "cross". According to tradition, the bonfire commemorates how Queen Helena found, by where the smoke of a bonfire descended, where to search for the true cross in Jerusalem, or how, by a series of bonfires, she signalled to her son Constantine in Constantinople her success in finding it.
Malankara
In the Malankara Syrian Orthodox Church a special offering called panchasarayumanda is made on this day, in particular at the Akaparambu Mor Sabor-Mor Aphroth Church in the Ernakulam District, Kerala.