GrubStreet's 2nd Floor Closed 3/18-3/20—From Monday, March 18th to Wednesday, March 20th, GrubStreet's 2nd Floor will be closed for repair work during our normal hours of operation, which means no in-person classes will be taking place. Porter Square Books: Boston Edition on the 1st Floor will still be open for shopping from 5:00pm-8:00pm on these days. The Center will reopen with normal operating hours at 10am on Thursday, March 21st. You can also shop PSB online and at their Cambridge location.