§ 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 7 of the public officers law. Provided, however, and notwithstanding the provisions of subdivision one of § 99 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.