On the same day as the Annunciation - 25 March.
Not only can they. THEY DO AND SHOULD. The Catholic Church is the first Christian Church, and was the Church that STARTED Christmas celebrations. OF COURSE they celebrate Christmas!
In the Roman Catholic Church
nothing
A Christmas Mass is said.
Chiefly, Christianity especially the Roman Catholic church.
It was very important. It ruled the world as the second incarnation of the Roman Empire.
Russians of Catholic faith celebrate with church rituals and events.
December 25 is the feast of the Incarnation - when the Word became flesh.
The quinceañera is not a Catholic tradition inasmuch as it is not a tradition of the Church and is not practiced everywhere that Catholics are present. The people who do celebrate the quinceañera, however, tend to be Catholic, as this is a Mexican tradition and Mexico is a mostly Catholic nation.
The Feast of the Annunciation is celebrated on the 25th of March
The pope for Roman Catholics (Catholics who attend mass in the Latin rite), as well as for Catholics of the Byzantine Catholic Church, the Ethiopian Catholic Church, the Greek Catholic Church, the Maronite Catholic Church, the Assyrian Catholic Church, and many more, none of which celebrate the Roman rite, but all of which are in union with the Pope.
Yes, Maronites are part of the Catholic church. They are an Eastern Catholic Church in full communion with the Holy See of Rome. Please see the related link below.