[Giants]

It looks very possible that the next game in the Stanford vs. Notre Dame football rivalry (the 35th) could be played at the Rose Bowl, capacity 92,542. 

The first Stanford vs. Notre Dame meeting was 1/1/1925 at the Rose Bowl. 53,000 were in attendance that day. They next played each other in the first two years of Ralston's career, 1963 and 1964, then the current rivalry started in 1989 and has played out every year since except for 1995-6 and 2020. Assuming both teams play each other in 2025, it will be their 38th meeting.

Which game in the Stanford vs. Notre Dame rivalry had the highest in-person official attendance?

I would guess 1989, the first year of the current series (with the exceptions you noted).

[Giants]

It looks very possible that the next game in the Stanford vs. Notre Dame football rivalry (the 35th) could be played at the Rose Bowl, capacity 92,542. 

The first Stanford vs. Notre Dame meeting was 1/1/1925 at the Rose Bowl. 53,000 were in attendance that day. They next played each other in the first two years of Ralston's career, 1963 and 1964, then the current rivalry started in 1989 and has played out every year since except for 1995-6 and 2020. Assuming both teams play each other in 2025, it will be their 38th meeting.

Which game in the Stanford vs. Notre Dame rivalry had the highest in-person official attendance?

I would guess 1989, the first year of the current series (with the exceptions you noted).