San Diego Comic-Con International is a multi-genre entertainment and comic convention held annually in San Diego, California. It was founded as the Golden State Comic Book Convention in 1970 by a group of San Diegans, which included Shel Dorf, Richard Alf, Ken Krueger, and Mike Towry; later, it was called the "San Diego Comic Book Convention". The name, as given on its website, is Comic-Con International: San Diego; but it is commonly known simply as Comic-Con or the San Diego Comic-Con or "SDCC". It is a four-day event (Thursday–Sunday) held during the summer at the San Diego Convention Center in San Diego, California. On the Wednesday evening prior to the official opening of the event, there is a preview for professionals, exhibitors, and select guests pre-registered for all four days.