Googled this story an found they are the benefactors, but nothing is said about their appearance at Harvard.
Stanford University has their history at www.Stanford.edu.
The history of their founding is quite remarkable and Mr. and Mr. Leland Stanford were devoted to the University they founded.
The urban myth of their visit to Harvard is included at the website.
Their only child, a son died of typhoid fever when he was just 16. They are reportedly to have then devoted themselves to treating the children of California as their own.