In this case, both the priest and the inquirer were mistaken, to some extent, in their respective understandings of the Church's sacramental discipline.
According to Roman Catholic discipline, the Occasionally, under special circumstances, a baptized non-Catholic Christian may receive the Eucharist if there is grave need, the Christian "spontaneously asks" for the sacraments, and if he cannot approach his own minister: Because Catholics believe that the celebration of the Eucharist is a sign of the reality of the oneness of faith, life, and worship, members of those churches with whom we are not yet fully united are ordinarily not admitted to holy Communion.
Since Episcopalians do not have valid holy orders, they do not have a valid Communion.
The fact that they believe that Jesus is in some way present in the Eucharist does not necessarily mean that they fully share Catholic faith in the nature of the Real Presence (although some do).
Christmas and Easter Masses are popular with non-Catholics, mainly because they are visiting Catholic family and friends.
Nuptial Masses, especially when one of the parties to be married is a non-Catholic Christian, will have large turnouts of non-Catholics (sometimes up to half the congregation).