Noun
fanac (uncountable)
(dated, fandom slang) The activity of fans, particularly of science fiction.
Conventions, clubs, and fanzines were the dominant form of fan activity, or "fanac", for decades, until the Internet facilitated communication among a much larger population of interested people. Source: Internet
Such activities are sometimes known as " fan labor " or " fanac ", an abbreviated form of the phrase "fan activity". Source: Internet