San Diego Comic-Con, the largest pop and culture festival in the world, hosts its inaugural event.

San Diego Comic-Con is a comic book convention and multi-genre entertainment event held annually in San Diego, California, at the San Diego Convention Center. Founded in 1970, originally showcasing primarily comic books and science fiction/fantasy media, Comic-Con has grown to include a large range of pop culture and entertainment elements across virtually all genres.

A comic book convention or comic con is a fan convention emphasizing comic books and comic book culture, in which comic book fans gather to meet creators, experts, and each other. Commonly, comic conventions are multi-day events hosted at convention centers, hotels, or college campuses. They feature a wide variety of activities and panels, with a larger number of attendees participating with cosplay than for most other types of fan conventions. Comic book conventions are also used as a method by which publishers, distributors, and retailers represent their comic-related releases. Comic book conventions may be considered derivatives of science-fiction conventions, which began during the late 1930s.

March 21 is the 80th day of the year in the Gregorian calendar; 285 days remain until the end of the year.