Mass. Gen. Laws ch. 140 § 180A
The following words, as used in this section and in sections one hundred and eighty B to one hundred and eighty F, inclusive, shall, unless the context otherwise requires, have the following meanings:
"Theatrical engagement", any engagement or employment of a person as an actor, performer or entertainer in a circus, agricultural fair, vaudeville, banquet and other stage performances, stage productions in theaters, including floor shows, so called, in restaurants, clubs, beer gardens, tents, arenas, halls and similar places of amusement.
"Booking agent, personal agent or actor's manager", any person who holds himself out as an agent of a person who is seeking employment or who is available for a theatrical engagement, including actors, actresses, chorus girls or chorus boys, musicians and entertainers of all descriptions.
Mass. Gen. Laws ch. 140, § 180A