Mass. R. Sup. Jud. Ct. 2:18
The justice designated to hear matters within the jurisdiction of a single justice at Boston will hear such matters once each week, except in the weeks in which his or her attendance with the full court is required during consultation or argument, and except as the number of cases to be heard does not require sitting. The sitting shall be on Wednesday, unless the single justice otherwise directs. A weekly list for hearing in Boston will be made up on which cases from any county may be set down, either by order of the court or by joint request of counsel, the hearing of which cases shall be subject to the discretion of the court. Matters to be heard before a single justice will be heard in Boston unless the full court or the single justice shall otherwise order. The single justice in his or her discretion may set any matter down for hearing in any place within the Commonwealth.
Mass. R. Sup. Jud. Ct. 2:18