Hugo Award
The World Science Fiction Society (WSFS) gives out the Hugo Awards each year for the best science fiction or fantasy works and achievements of the previous year. The award is named after Hugo Gernsback, who founded the pioneering science fiction magazine "Amazing Stories" and who is considered one of the "fathers" of the science fiction genre. Works are eligible for an award if they were published in the prior calendar year, or translated into English in the prior calendar year. There are no written rules as to which works qualify as science fiction or fantasy, and the decision of eligibility in that regard is left up to the voters, rather than to the organizing committee. Hugo Award nominees and winners are chosen by supporting or attending members of the annual World Science Fiction Convention, or Worldcon, and the presentation evening constitutes its central event. The selection process is defined in the WSFS constitution as instant-runoff voting with five nominees per category, except in the case of a tie. The awards are split over more than a dozen categories, and include both written and dramatic works.
Hugo Award
Prior to 2017, these could be awarded for the ten years that had a Worldcon where no Hugos were awarded: the conventions in 1939–41, 1946–52, and 1954. Retro Hugos under these rules were given five times: in 1996, 2001, and 2004 for 50 years prior, and 2014 and 2016 for 75 years prior. The Worldcons eligible in 1997–2000, 2002, and 2015 chose not to award Retro Hugos, and under these rules there would have been no more opportunities to award them until 2022 (for 1947).