What constitutes a public body?
While there is no comprehensive list of public bodies, any multi-member board,
commission, committee or subcommittee within the executive or legislative branches1
of state government, or within any county, district, city, region or town, if established to
serve a public purpose, is subject to the law. The law includes any multi-member body
created to advise or make recommendations to a public body, and also includes the
governing board of any local housing or redevelopment authority, and the governing
board or body of any authority established by the Legislature to serve a public purpose.
Boards of selectmen and school committees (including those of charter schools)
are certainly subject to the Open Meeting Law, as are subcommittees of public bodies,
regardless of whether their role is decision-making or advisory.
The above can be found by looking up the Massachusetts Open Meeting Law guide.