Short answers, pulled from the story.
Nobuyuki Takahashi wrote an article for the Japanese magazine Comic Com in June 1983 to introduce the new word. He selected this phrase over existing translations like masquerade because it felt less old-fashioned.
The practice began with Morojo's futuristicostumes at the 1st World Science Fiction Convention on the 17th of August 1939. Forrest J Ackerman and Myrtle R. Douglas wore green capes and breeches based on pulp magazine artwork by Frank R. Paul that year.
Comic Market known as Comiket became the single largest event featuring cosplay in Japan during summer and winter. It attracts hundreds of thousands of fans to the roof of the exhibition center.
The first World Cosplay Summit occurred on the 12th of October 2003 at the Rose Court Hotel in Nagoya. Five cosplayers from Germany France and Italy competed in this inaugural international contest before expanding to include teams from forty countries by 2005.
Rochelle Keyhan Erin Filson and Anna Kegler started the Cosplay Is Not Consent movement in 2013 to address harassment including verbal abuse touching and groping directed at participants. New York Comic Con placed large signs at its entrance in 2014 reminding attendees to ask permission before taking photos.