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List of 2003 California Conventions
| Convention | Dates | Location |
|---|---|---|
| Gallifrey One 2003 | February 14-17, 2003 | Airtel Plaza Hotel Van Nuys, CA, USA |
| Ani-Jam 2003 | March 28, 2003 | Ramada Fresno North Fresno, CA, USA |
| ConFurence 2003 | April 25-27, 2003 | Hilton Burbank Airport & Convention Center Burbank, CA, USA |
| WonderCon 2003 | April 25-27, 2003 | Moscone Center San Francisco, CA, USA |
| Anime Overdose 2003 | May 3-4, 2003 | Santa Clara University Santa Clara, CA, USA |
| E3 2003 | May 14-16, 2003 | Los Angeles Convention Center Los Angeles, CA, USA |
| FanimeCon 2003 | June 20-22, 2003 | Santa Clara Convention Center Santa Clara, CA, USA |
| Hayward-Con 2003 | June 22, 2003 | Centennial Hall Hayward, CA, USA |
| Anime Expo 2003 | July 3-6, 2003 | Anaheim Convention Center Anaheim, CA, USA |
| Comic-Con International: San Diego 2003 | July 17-20, 2003 | San Diego Convention Center San Diego, CA, USA |
| JapanTown Anime Faire 2003 | September 13-14, 2003 | Best Western Miyako Inn San Francisco, CA, USA |
| Mania Fest 2003 | September 18-21, 2003 | Laemmle Monica Santa Monica, CA, USA |
| Ani-Magic 2003 | October 3-5, 2003 | Best Western Antelope Valley Inn and Conference Center Lancaster, CA, USA |
| Yaoi-Con 2003 | October 17-19, 2003 | Renaissance Parc 55 San Francisco, CA, USA |
| ParaCon: Anime Festival 2003 | October 19, 2003 | Paramount's Great America Santa Clara, CA, USA |
| Super-Con 2003 | October 19, 2003 | Centennial Hall Hayward, CA, USA |
| Anime: A Celebration 2003 | November 1-2, 2003 | UC Berkeley Art Museum & Pacific Film Archive Berkeley, CA, USA |
| RECCA Con 2003 | November 15, 2003 | Los Medanos College Pittsburg, CA, USA |
| Gen Con So Cal 2003 | December 11-14, 2003 | Anaheim Convention Center Anaheim, CA, USA |
| Convention | Dates | Location |