Who are the man who made the great supper, the guests who made excuses, and those who were brought in?

Luke doesn't say, and tells of no explanation. Jesus tells the story to one of those at the table, who had said, "Blessed is he who will feast in God’s Kingdom!" (14:15): "But he said to him, “A certain man made a great supper, and he invited many people." (14:16). Those first invited "all as one began to make excuses" (14:18), the poor, maimed, blind and lame are brought in (14:21), and the story ends with the lord's words: "For I tell you that none of those men who were invited will taste of my supper. For many are called, but few are chosen." (14:24). Luke tells nothing of what the man at the table said next. These notes don't say who the man, the servant, the guests who made excuses or those brought in are, and make the story a verdict on no people, then or now.