It was founded as the Golden State Comic Book Convention in 1970 by a group of San Diegans that included Shel Dorf, Richard Alf, Ken Krueger, and Mike Towry; later, it was called the "San Diego Comic Book Convention". It is a four-day event (Thursday–Sunday) held during the summer (in July since 2003) at the San Diego Convention Center in San Diego. On the Wednesday evening prior to the official opening, professionals, exhibitors, and pre-registered guests for all four days can attend a pre-event "Preview Night" to give attendees the opportunity to walk the exhibit hall and see what will be available during the convention.
Comic-Con International also produces two other conventions, WonderCon, held in Anaheim, and the Alternative Press Expo (APE), held in San Francisco. Since 1974, Comic-Con has bestowed its annual Inkpot Award on guests and persons of interest in the popular arts industries, as well as on members of Comic-Con's board of directors and the Convention committee. It is also the home of the Will Eisner Awards.
Originally showcasing primarily comic books and science fiction/fantasy related film, television, and similar popular arts, the convention has since included a larger range of pop culture and entertainment elements across virtually all genres, including horror, animation, anime, manga, toys, collectible card games, video games, webcomics, and fantasy novels. According to Forbes, the convention is the "largest convention of its kind in the world;" Publishers Weekly wrote "Comic-Con International: San Diego is the largest show in North America;" it is also the largest convention held in San Diego. In 2010, it filled the San Diego Convention Center to capacity with more than 130,000 attendees. In addition to drawing huge crowds, the event holds several Guinness World Records including the largest annual comic and pop culture festival in the world.
According to wikipedia