From their website:
The Chicago Objectivist Society is pleased to announce the presenters and presentations planned for our inaugural Chicago Objectivist convention, which will take place over Labor Day weekend (September 3rd & 4th). If you can join us, please preregister here.
I wish we were able to go, but we already have other travel plans this summer. That being said, I was fortunate enough to go to OCON last summer and SnowCon in January, and these Objectivist conferences are a great way to mingle with other like-minded people, learn new ideas and learn how to apply Rand's philosophy to your daily life. If you aren't able to make it to AtlosCon or OCON, try it make it out to one of these other mini-conferences that are popping up all over the place. It's an exciting time to be an Objectivist! =)