This election was was held on June 5, 1933. In it, voters elected delegates to the Illinois convention on the proposed Twenty-first Amendment to the U.S. Constitution (repealing Eighteenth-Amendment Prohibition).
Source for Popular Vote data: Illinois Secretary of State, comp., "Vote for Delegates to State Convention to Consider Ratification of Proposed Amendment to Federal Constitution (Repealing Eighteenth Amendment)," Blue Book of the State of Illinois, 1933-1934 (Springfield: Journal Printing Company, 1933)