Being listed on any Catholic Church's calendar is official recognition. A saint does not have to be on the Roman Rite calendar to be official.Are the Eastern Catholic Churches not subject to Rome? How can you commemorate someone they do not recognize?
Because the Roman RITE is not, contrary to some ultramontane triumphalists, the be all-end all of the RCC.
So you are saying that the Eastern Catholic "rites" are not subject to the Pope of Rome?
Rome has seen fit to let the sui juris
churches of its communion commemorate whom they wish. In a very real sense, Rome has executed its authority with a very free hand.
If one would take the time to look, one would find a number of Eastern Catholic saints and blesseds missing from the offical calendar of Roman RITE. Off the top of my head, Bl. Theodore Romzha was not commemorated in the list of saints (during which "Blesseds" are also commemorated) during the Anaphora at the local Roman Catholic church I last went to back on Nov 1, 2007, even though Pope John Paul II beatified him in 2001 (and assigned Nov 1 as his feast day) and the pastor of that RC church was very diligent in saying the Roman Calendar's saints names on any given day. I would be surprised if Bl. Theodore's name was actually on the Roman Calendar. On the Ruthenian calendar, St. Gregory Palamas is celebrated and we both know that he is certainly not on the Roman Calendar.
We see this phenomenon even in Orthodoxy. Take, for example, St. Alexis Toth of Wilkes-Barre. I would be incredibly surprised to find him commemorated on Mt. Athos on May 7, but, at the same time, none of the holy fathers there would dare to call in question his sainthood.
The Eastern Catholic Churches have, since Vatican II, have been given an enormous amount of freedom. Do not mistake me: they are subject to the Roman pontiff. However, since at least the pontificate of JPII, they have been given quite a long leash, so to speak.