Originally Posted by Tradycja
Latins who are attracted to the East tend to become obsessed with "officially" being a member of the Eastern rite Church. This is unnecessary. Just start going there, no parish is going to turn you away if you regularly go to their church and contribute. The East is less concerned with all of the technicalities of things than we Latins are. The fact that most Eastern Churches in the States follow the Gregorian Calendar make it very easy to integrate yourself, being a Latin, into the Eastern parish life. You just need to make sure not to miss the Holy Days of Obligation in your rite. This is easy because the Holy Days of Obligation are minimal in the Latin rite being that most are moved to Sunday.
No one in the Latin Church is really going to miss you because the Roman Catholic parishes are so big anyway that they don't know their parishioners. (This is actually a problem but we all know it's true). I went for daily Mass for two years to a certain parish and the priest never even tried to talk to me.
The importance of being enrolled has to do with sacramental discipline and rights and obligations of the faithful. The clergy are to uphold this sacramental discipline and the faithful do not have the same rights in a different Catholic Church sui iuris than in their own. One is enrolled in a Church sui iuris (and thereby have rights, and obligations to it) by virtue of the parents enrollment, for an infant, or by the tradition of their baptism, if an adult convert. If one wants to be a deacon, or a priest, or a bishop, or receive some of the Holy Mysteries in their favorite Church sui iuris
, rather than the enrolled Church sui iuris, it can be very significant. It can even invalidate an marriage if the canons are not followed.
Truly, some of the parishes are so big that the pastors have a hard time knowing their people.