Doujinshi convention

Comiket, the largest of all doujinshi conventions, attracts 35,000 sellers and over half a million individual visits during each of its biannual editions.

[2] Most conventions are organized by the amateur creators themselves, and most focus on the sale of doujinshi that are fanworks.

Doujin works are typically fanworks based on existing properties ("niji sōsaku").

Many conventions feature not just fanworks but also original (創作, sōsaku, ororijinaru) doujinshi.

Many kinds of companies support doujinshi conventions through sponsorship, direct participation, or providing various necessary services.

Comiket, for instance, has a "corporate area" where mostly media companies sell or give away goods and merchandise.

Only events feature only doujinshi about one particular fandom, one particular character, or one particular pairing or fan trope.