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Your question points to the likelihood of Oswald’s killing of JFK being a more impulsive crime of opportunity with just a couple of weeks of planning at most. Early in 1963, Oswald had attempted to kill the far-right extremist General Edwin Walker, though his identity as Walker’s would-be assassin was not determined until the Warren Commission did so - after Oswald and JFK were both dead.
JFK’s motorcade route was published in the major Dallas newspapers a couple of weeks in advance.