Comic Market , more commonly known as Comiket or Comike , is a semiannual doujinshi convention in Tokyo, Japan. A grassroots market focused on the sale of doujin (self-published) works, Comiket is a not-for-profit fan convention administered by the volunteer-run Comic Market Preparatory Committee (ComiketPC). Inaugurated on 21 December 1975 with an estimated 700 attendees, Comiket has since grown to become the largest fan convention in the world, with an estimated turnstile attendance of 750,000 in 2019. Comiket is typically held at Tokyo Big Sight in August and December, with the two events distinguished as Summer Comic Market and Winter Comic Market , respectively.