From the ILGA Legislative Information Services : House will convene at Noon tomorrow.
What makes a Veto Session different than Regular Session is the votes required to pass a bill. During the veto session, a bill that takes effect immediately needs a three-fifths vote to pass — 71 votes in the House and 36 in the Senate.
After Jan. 1, that drops to 60 votes in the House and 30 in the Senate.