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List of 2003 Illinois Conventions
| Convention | Dates | Location |
|---|---|---|
| Adepticon 2003 | March 14-16, 2003 | Holiday Inn Chicago O'Hare - Rosemont Rosemont, IL |
| Costume-Con 2003 | April 18-21, 2003 | DoubleTree by Hilton Hotel Chicago - North Shore Conference Center Skokie, IL |
| Anime Central 2003 | May 16-18, 2003 | Hyatt Regency O'Hare Chicago Rosemont, IL |
| The Official Transformers Collectors' Convention 2003 | July 26-27, 2003 | Hyatt Recency O'Hare Chicago, IL |
| Wizard World Chicago 2003 | August 8-10, 2003 | Donald E. Stephens Conventions Center Rosemont, IL |
| Kazecon 2003 | October 10-12, 2003 | Ramada Plaza O'Hare Rosemont, IL |
| Anime Reactor 2003 | October 24-26, 2003 | Holiday Inn - O'Hare Rosemont, IL |
| WindyCon 2003 | November 7-9, 2003 | Hyatt Regency Woodfield Schaumburg, IL |
| Midwest FurFest 2003 | November 21-23, 2003 | Hyatt Regency Schaumburg, Chicago Schamburg, IL |
| Chicago TARDIS 2003 | November 28-30, 2003 | Sheraton Northwest Chicago Arlington Heights, IL |
| Convention | Dates | Location |