Massachusetts Superior Court Rule 34:
Engagements of Counsel
No party shall have a right to a postponement of a trial because of engagement of counsel or for the convenience of counsel or parties, but the court will grant a postponement if counsel is actually engaged before the Supreme Judicial Court or the Appeals Court and may grant a postponement because of engagement of counsel for not more than ten days or until said engagement is concluded.
No other postponement shall be granted to the same counsel except for good cause arising subsequent to the granting of the postponement.
(Applicable to civil actions)