So who has turned this simple ceremony into a show?
You are under the impression that the Mass is a repetition or re-presentation of the Last Supper. You are mistaken.
Nevertheless, for your information, if Jesus and his apostles followed social conventions of the time, they would all have been on the same side of the table -- not facing one another across the table.
By the way, when Jesus and other Jews went to the Temple to pray, they used a language which had fallen out of everyday use and required study to understand.
Since you ask, the Mass has been turned into a talent show by innovators who have misunderstood or misinterpreted the documents of Vatican II -- which say nothing at all about the novelty of turning the priest around to face the people, like a narrator and show host.
Your liturgical catechesis is badly out of whack. Seek help.