Corpus Christi makes sure we don’t miss the point of Holy Thursday. That the Last Supper is the First Eucharist. The epistle (1 Corinthians) is the key to Corpus Christi. In plain language Jesus tells us what/Who it is.
That’s why the Catholic Church is so big on the Eucharist. The Church wants each of us to have an intimate, personal relationship with the One who loves each one of us enough to do what it takes to save us. And Who would have done the same thing, even if you or I were the only one who needed saving.
How does the Eucharist fit into that? The Church is just following what Jesus said is the way to make that connection as close and real as it can be on this side of eternity.
So what’s with the procession? Old school outreach. Literally taking it to the streets. This is the good stuff, and it’s too good to keep to ourselves.