Dr. Blasey said another boy, Mark Judge, was in the room at the time and jumped on top of them in the bed, sending them all tumbling. She was able to free herself and escape the house, she said. Mr. Judge has told the Judiciary Committee that he remembered no such incident and had never seen Judge Kavanaugh behave in such a way.

The only other two people identified as being in the house at the time, but not the bedroom, have also said in recent days that they did not recall the incident. Patrick J. Smyth said he did not remember such a party or see any improper conduct by Judge Kavanaugh. Leland Keyser, a former classmate of Dr. Blasey’s at Holton-Arms, said she did not know Judge Kavanugh or remember being at a party with him.

Debra Katz, a lawyer for Dr. Blasey, noted that her client had not told anyone about her story for years.

“It’s not surprising that Ms. Keyser has no recollection of the evening as they did not discuss it,” Ms. Katz said. “It’s also unremarkable that Ms. Keyser does not remember attending a specific gathering 30 years ago at which nothing of consequence happened to her. Dr. Ford of course will never forget this gathering because of what happened to her there.”

Judge Kavanaugh will offer the calendars to the Senate committee as part of his defense. Sensitive to the potential backlash over questioning the credibility of a woman alleging sexual misconduct, Judge Kavanaugh’s advisers said he will not challenge her account of being assaulted but will argue that it was not him. Some of Judge Kavanaugh’s supporters have also claimed that it is a case of mistaken identity.

The calendar pages are one-month pages with each day in a small box. Unusual for a teenager, Judge Kavanaugh seemed to keep track of his days even during summer vacation. The pages show typical teenage activities from the era, including “beach week” after the end of the school year and nights at the theater to see “Grease II,” “Rocky III” and “Poltergeist” with friends.

Judge Kavanaugh was gone many weekends with his parents in St. Michaels, Md., and one weekend in Connecticut with his grandmother, according to the calendars. He listed an interview for Yale University, where he would eventually enroll, and the start of football camp in August, when he stayed in the dorms at Georgetown Prep. He also played summer league basketball.