Thai Cosplay Festival, Bangkok 2013, Thailand

Cosplayers typically come from the ranks of otaku--that is, fans of Japanese comic books, known as manga. They gather at public events such as comic-book and video game trade shows, as well as at dedicated cosplay parties at nightclubs or amusement parks. In Japan teenagers gather with like-minded friends in places like Tokyo's Harajuku district to engage in cosplay. Since 1998 Tokyo's Akihabara district has contained a large number of cosplay cafés, catering to devoted anime and cosplay fans. The waitresses at such cafés dress as game or anime characters; maid costumes are particularly popular. In areas outside of Japan, cosplay is primarily done at manga and anime conventions.
The single largest event featuring cosplay is the semi-annual doujinshi market, Comiket. This event, held in Japan during summer and winter, attracts hundreds of thousands of manga fans. Thousands of cosplayers congregate on the roof of the exhibition centre. The largest event for cosplayers outside Asia is the annual San Diego Comic-Con held in the California city in the USA. The biggest event in the UK is the London MCM Expo at ExCeL London
Cosplayers in Japan refer to themselves as reiyā (レイヤー); pronounced "layer". Those who photograph players are called cameko, short for "Camera Kozō" or "Camera Boy". Originally the cameko give prints of their photos to players as gifts. Increased interest in cosplay events both on the part of photographers and cosplayers willing to model for them have led to formalisation of procedures at events such as Comiket. Photography takes place within a designated area removed from the exhibit hall.
Cosplay at fan events likely originated in Japan in 1978. Cosplay nevertheless gets a mixed reception in Japan even today. Events in districts such as Akihabara draw many cosplayers, yet there is no shortage of people in Japan who regard cosplay as a frivolous endeavor.