Constitution of the State of Illinois Art. IV, § 5. Sessions

(a) The General Assembly shall convene each year on the second Wednesday of January. The General Assembly shall be a continuous body during the term for which members of the House of Representatives are elected.

(b) The Governor may convene the General Assembly or the Senate alone in special session by a proclamation stating the purpose of the session; and only business encompassed by such purpose, together with any impeachments or confirmation of appointments shall be transacted. Special sessions of the General Assembly may also be convened by joint proclamation of the presiding officers of both houses, issued as provided by law.

(c) Sessions of each house of the General Assembly and meetings of committees, joint committees and legislative commissions shall be open to the public. Sessions and committee meetings of a house may be closed to the public if two-thirds of the members elected to that house determine that the public interest so requires; and meetings of joint committees and legislative commissions may be so closed if two-thirds of the members elected to each house so determine.