The Chicago Democrat told reporters Wednesday that it’s a matter of logistics for planning an event that will involve numerous activists and advocates involved in lobbying for the measure.
He says it’s important for people who worked to pass the legislation to be at the bill signing.
When Quinn signed Illinois’ civil union bill in January 2011, roughly 1,000 people attended the event at the Chicago Cultural Center.
Under the marriage measure, same-sex couples can get married starting in June.
Both chambers took votes on the bill Tuesday after months of lobbying.
Illinois will become the 15th state to allow same-sex marriage. The law will come into effect on June 1, 2014.
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