From the Archdiocese of Boston:
Updated mask mandate
In the light of spiking numbers of new COVID cases and the likely increase in those numbers in the upcoming holiday season, Cardinal Seán is mandating that throughout the archdiocese all people attending public Masses, including weddings and funerals, wear masks. This mandate takes effect the weekend of December 18/19, 2021, and expires on January 17, 2022.
The last 6 pews on both sides of the church have been designated for people who would like to socially distance while wearing a mask. PLEASE DO NOT SIT in these areas unless you maintain your distance