Q. Would the phrase “The Board of Trustees meeting” be considered an attributive noun? Or should possession be indicated with an apostrophe? Thank you for your assistance.
A. Better to write “board of trustees’ meeting.” When it is a matter of drawing the line between the possessive (or genitive) form and the attributive (adjectival) form, CMOS generally sides with the former, adding the apostrophe unless there’s no possessive meaning or unless it is a matter of an official, published form that does not carry the apostrophe. See paragraph 7.25 in CMOS 16 for examples.