§ 260-a. Meetings of board of trustees. Every meeting, including a special district meeting, of a board of trustees of a public library system, cooperative library system, public library or free association library, including every committee meeting and subcommittee meeting of any such board of trustees in cities having a population of one million or more, shall be open to the general public. Such meetings shall be held in conformity with and in pursuance to the provisions of article seven of the public officers law. Provided, however, and notwithstanding the provisions of subdivision one of section ninety-nine of the public officers law, public notice of the time and place of a meeting scheduled at least two weeks prior thereto shall be given to the public and news media at least one week before such meeting.