Illinois Governor Pat Quinn is expected to sign a gay marriage bill into law on Wednesday.

Three-thousand people are expected to show up for the bill's signing ceremony, which will take place at UIC Forum, the 22,000 square foot open space at the University of Illinois in Chicago.

“Marriage equality is coming to Illinois,” Quinn, a Democrat, said in announcing details of the signing ceremony. “I look forward to signing this landmark legislation on November 20 and celebrating a big step forward with the people of Illinois.”

In 2011, Quinn signed a civil unions bill into law at an event that drew roughly 1,000 people to the Chicago Cultural Center.

The Illinois Senate approved the marriage bill on Valentine's Day, the House followed suit earlier this month by a slim margin.

Passage in Illinois follows similar gains this fall in New Jersey and Hawaii.

The law will take effect on June 1, 2014.

(Related: Passage of gay marriage to blame for Illinois tornadoes, Catholic group suggests.)