I once read a description of the Mass that said that during the Eucharistic Prayer, the veil that separates heaven from earth is temporarily removed, so that as the priest says, and I paraphrase, “We join the angels and saints in your hymn of praise”, the altar is actually filled with the heavenly hosts and we quite literaly join our praises with theirs.
It was a long time ago that I read the book and I did not do justice in relating the theme, but ever since then, when I am at Mass, I love to think about the angels and saints actually being present.
It really is a heavenly banquet.