Before watching the movie:
On the surface, this looks like just as much fluff as State Fair, but the setup sounds rather dark. It’s a man’s one more day to get it right with his family after a fatal accident. Moreover, one summary I saw specifically calls him abusive, though that’s probably from subtext. Depressing themes in a musical? Not something one would expect before the late 60s.
But then it manifests as flowy dancing around a carnival, so it can’t be entirely bleak.