I don’t think you can speak of such an event. Where, exactly, in the constant and gradual evolution from Homo habilis circa 2.5 million years ago and the first homo species to pass the Y chromosome down to all human males today 338,000 years ago do you draw a distinct line and say this father and mother was not a modern human but their descendants all were? Do you exclude homo heidelbergensis of 600,000 years ago, the common ancestor of Neanderthals and Modern Humans?
Evolution does not proceed in sudden jumps. The creationists that talk about a Crockaduck fossil not being found are spouting nonsense. Evolution is a steady progression of continuous and small adaptations, and it’s still going on today.