Are Eastern "Masses" valid? Should Catholics receive Communion at them?
The short answer
The consecration is valid in both Eastern Catholic and Eastern Orthodox divine liturgies. A Roman-rite Catholic may receive Communion at an Eastern Catholic liturgy, which also fulfills the Sunday obligation. Orthodox liturgies do not fulfill it, and Catholics ordinarily should not receive Communion there, though some circumstances permit it.
Terms
In the East, the Mass is called the divine liturgy. Eastern churches in union with Rome are Eastern Catholic; those not in union are usually called Eastern Orthodox.
Valid in both
The consecration of the Eucharist in both Eastern Catholic and Eastern Orthodox divine liturgies is valid.
Eastern Catholic liturgies
A Roman-rite Catholic can attend and receive Communion at an Eastern Catholic divine liturgy without problem, and it fulfills the Sunday or holy-day obligation.
Eastern Orthodox liturgies
Catholics may occasionally attend as guests, but these liturgies do not fulfill the obligation, and Catholics ordinarily should not receive Communion there, though in some circumstances it is permitted.
Not sure which is which?
Call your local diocese and ask.
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