When the Buenos Aires International Film Festival invited him to be a member of the jury, nobody seriously expected a positive answer. Much to the organizer’s surprise, however, César Aira accepted the invitation and turned out to be an extremely discerning, competent and witty juror. Afterward he disappeared as discreetly as he had appeared.
Half a year later, the festival was surprised to receive a short story by Aira entitled Festival.
Festival may not be coming out in English anytime soon. But here's another story of Aira's appropriation of a true story he heard from Kent Johnson (here--somewhere in the comments, retold here) as basis of the opening of one of his recent books (not sure which).