Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 215, § 58

The probate court shall be open daily on days other than Saturdays, Sundays and legal holidays, for hearings, matters in equity, proceedings in contempt and for making orders, judgments and decrees in matters before them, except that, if the convenience of the public so requires, a court shall be open on any Saturday, not a legal holiday, for said purposes during such hours as the judge or judges thereof may determine. Notwithstanding the foregoing provisions, the times of hearings shall be discretionary with the judges of said courts.