65 ILCS 5/4-5-12
Regular meetings of the council shall be held on the first Monday after the mayor and commissioners have entered upon the performance of their official duties, and at least twice each month thereafter. The council shall provide by ordinance for the holding of regular meetings. Special meetings may be called from time to time by the mayor or by 2 commissioners upon giving notice of not less than 24 hours to all members of the council. Public notice of meetings must also be given as prescribed in Sections 2.02 and 2.03 of "An Act in relation to meetings", approved July 11, 1957, as heretofore or hereafter amended. All meetings of the council, whether regular or special, shall be open to the public.
The mayor and each commissioner shall have the right to vote on all questions coming before the council. Three members of the council shall constitute a quorum, and the affirmative vote of 3 members shall be necessary to adopt any motion, resolution, or ordinance, unless a greater number is provided for by this article.
Upon every vote the "yeas" and "nays" shall be called and recorded. Every motion, resolution, or ordinance shall be reduced to writing and read before a vote is taken thereon, and all council members present at any meeting shall vote thereon. The style of all ordinances shall be: "Be it ordained by the council of the city (or village) of ....."
The mayor shall have no power to veto, but every resolution, ordinance or warrant passed or ordered by the council must be signed by the mayor, or by 2 commissioners, and all ordinances and resolutions shall be filed for record, before they shall be in force.
65 ILCS 5/4-5-12