You may still be able to get a slot if you race for charity or with an international tour group so be sure to check out that option if you are dead set on running there. From their site:
Register through a Charity
Register through one of our affiliated Charities to utilize their social and philanthropic networks, fundraising opportunities and training programs. Qualified charities have an extended but limited registration offering after Open registration is closed.
Register through an International Tour Group
Register through one of our affiliated International Tour partners. Tour groups from countries outside the U.S. can plan your travel, accommodations and race entry. Qualified tour groups have an extended but limited registration offering after Open registration is closed.
It is a pretty extensive list of charities, including many national ones. So it is possible that you could find a charity that you’d like to support with your running!
I am a little surprised that registration filled so quickly after last year, but I guess many people also recognize that it was a fluke, crazy year and that many marathons experienced trouble that weekend.
Registration is still open for Twin Cities Marathon, which is the week before.
[tags] Marathon, Chicago, Twin Cities [/tags]