This sounds almost exactly like the Rolling Stone “Rape on Campus” hoax story/
When investigated everyone of these people fails the truth and reality test. Not one of them have first hand knowledge of any such activity.
None of those who were reported as being able to back this claim up actually saw anything or heard anything. In fact about half of them say they have zero memory of anything happening. The remainder say they remember hearing something about a like activity but were not told Kavanaugh had anything to do with it.
What we have here is just another left wing liar trying to tarnish Kavanaugh’s name.