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The actors often give out free autographs to the fans, perhaps in exchange for a flat appearance fee, and sometimes may performs songs that have no relevance to the shows so as to entertain the fans. Such conventions are usually quite expensive and are hosted in hotels. There are often tight security for the celebrities to protect against potentially fanatic fans.
Science fiction conventions are a very popular type of convention, the biggest of which is Worldcon. From such cons has arisen the widespread stereotype of the fans' tendency to dress up as their favorite characters in elaborate costumes that are time-consuming and/or expensive to assemble. Fans may also speak in fictional languages relevant to the theme of the convention.Fandom