To establish by-laws; to fix the number necessary for a quorum; to set up an executive committee of its members to exercise all powers of the board except as limited by the board; to establish rules and regulations, not inconsistent with the provisions of this Article, as are necessary for the administration of the system; and generally to carry on any other reasonable activities which are deemed necessary to accomplish the purposes of this system, including without limitation the time and manner of reporting contributions by participants and, if applicable, contributions by employers.
40 ILCS 5/15-177