Fan Expo Chicago (formerly Wizard World Chicago Comic Con, and commonly known as the Chicago Comicon), is a comic book convention held during the summer in Rosemont, Illinois, United States, at the Donald E. Stephens Convention Center. It was traditionally a three-day event (Friday through Sunday), but in 2006, it expanded to four days (Thursday through Sunday). It was founded in 1972 as Nostalgia '72, Chicago Comic Con and later as the Chicago Comic and Nostalgia Convention by a local dealer (and school teacher) named Nancy Warner.