Mass. Gen. Laws ch. 138 § 17B
In any city or town which accepts the provisions of this section, a local licensing authority which granted seasonal all alcoholic beverage or wine and malt beverage licenses as set forth in section fifteen, on or before June thirtieth, nineteen hundred and eighty-four, is hereby authorized to grant, in addition to, the number of licenses which may be issued pursuant to section seventeen, but subject to all other provisions of this chapter, additional all alcoholic beverage licenses at a rate of one such all alcoholic beverage license per year; provided, however, that said additional licenses shall be granted only to holders of said seasonal licenses; provided, further, that the holder of said seasonal license surrenders such license; and provided, further, that the total number of seasonal licenses that the local licensing authority may issue pursuant to said section seventeen shall be reduced by one for each new license issued.
Mass. Gen. Laws ch. 138, § 17B