Apparently Kavanaugh is offering as evidence his 1982 calendar as evidence he didn't attend the alleged party.
Here
In the first place, why would he write it down if he committed a crime and in the second place, how would he remember it? Apparently he was stumbling drunk, it is possible he was so drunk he doesn't remember it.
And thirdly, kind of weird for a man to be keeping memoirs of his high school year all these many years later, just saying it is usually a woman thing. You know scrapbooking was a fad a few years ago.