Professor Bret Weinstein objected to “a suggestion that white students and professors leave campus for a day, a twist on a tradition of black students voluntarily doing the same.”
Some background on the tradition:
… [T]he college’s Day of Absence… [is] a tradition in which black people leave the campus to show what the place would be like without them.
To change things a little,
[t]his year, organizers suggested the reverse: that white people who wanted to participate would leave while nonwhites stayed, and both groups would attend workshops to, as the email announcement put it, “explore issues of race, equity, allyship, inclusion and privilege.”
It ended up in protests and threats of violence so bad that the college had to hold its commencement at a rented baseball stadium 30 miles from campus where everyone had to pass through metal detectors.
Read more about it at the New York Times.