Over 3,000 same-sex couples got married in Chicago since the practice became legal last February.
About 2,000 people gathered at the University of Illinois at Chicago to watch the historic event.
The North Side alderman traveled to Seattle to wed his partner of 22 years.
Those interested in attending can register on the governor's site.
State Rep. John D'Amico credited proponents of same-sex marriage for changing his mind about the measure.
Hundreds came to celebrate the long-awaited milestone at Sidetrack bar, where Rahm Emanuel stopped by.
Supporters of gay marriage hope the poll will sway state Rep. John D'Amico to vote yes on the measure.
The Supreme Court is expected to announce sometime this week its decision on two same-sex marriage cases.
After state lawmakers failed to vote on gay marriage, proponents said they don't want them in the parade.
Game-changing Supreme Court cases were on marchers' minds during a rally through the Loop Monday night.
The rock star penned an opinion piece in the Belleville newspaper.
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