Harvard: “We will begin transitioning to virtual instruction for graduate and undergraduate classes. Our goal is to have this transition complete by Monday, March 23, which is the first day of scheduled classes following Spring Recess.
Students are asked not to return to campus after Spring Recess and to meet academic requirements remotely until further notice. Students who need to remain on campus will also receive instruction remotely and must prepare for severely limited on-campus activities and interactions. All graduate students will transition to remote work wherever possible. Schools will communicate more specific guidance and information, and we encourage everyone to review previous guidance about both international and domestic travel.
We are transitioning over the course of the next few days to non-essential gatherings of no more than 25 people. Please note this is a change from prior guidance.”
https://www.harvard.edu/covid-19-moving-classes-online-other-updates