Unfortunately I doubt that I will be much help in answering your questions there. I believe that the first Pentecost was in fact when the Church got started as the Body of Christ, and the wedding feast of the Lamb is indeed when the final celebration is going to be, but I don’t have any definite encyclicals or council documents that say this.
One thing I do need to ask is why this is such an important question. I cannot think of any matter of everyday life that this would have an effect on.
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