40 ILCS 5/9-189

The board shall hold regular meetings in each month and special meetings as it deems necessary. A majority of the members shall constitute a quorum for the transaction of business at any meeting, but no annuity or benefit shall be granted or payments made by the fund unless ordered by a vote of the majority of the board members as shown by roll call entered upon the official record of the meeting. Meetings of the board shall be open to the public.