Washington (CNN) Lawyers for Christine Blasey Ford, the woman accusing Supreme Court nominee Brett Kavanaugh of sexual assault, have sent the Senate Judiciary Committee sworn and signed declarations from four people who say they have known of her allegation well before it became public.

Meanwhile, Kavanaugh's lawyers have sent the committee pages from his 1982 calendar to bolster his claim that he wasn't at the house party where Ford alleges the assault took place.

The documents, first reported by USA Today, are likely to figure prominently in Thursday's high-stakes hearing, in which both Ford and Kavanaugh will testify before the committee.

Ford's husband says she first told him the details of the alleged assault in couple's therapy in 2012, and a friend, Keith Koegler, said Ford discussed the matter with him in 2016 and mentioned Kavanaugh's name in June of this year, the documents show. None of the four signed declarations is from a person with first-hand knowledge of the incident or eyewitness accounts, but all say they knew of her accusation before it was made public and before Kavanaugh was nominated in July.

Kavanaugh's lawyers sent the committee five pages from his calendar from the summer of 1982. The pages of the calendar show that Kavanaugh listed his chores, sleepovers with friends, a beach trip and some parties that summer.

Read More