We reached out to Harvard and they responded that "...the closure [was] temporary and it [was] COVID-related as we welcomed students, faculty, and some staff back to campus. There was a cohort of our international population who did not have access to vaccines and we needed time to address that and provide some outdoor space for those in quarantine. It just so happens that gates will be open beginning today after the three day holiday now that we have our population settled into campus." To follow up directly about this, you can contact Harvard Public Affairs via email at community@harvard.edu