Notable events included world premiere screenings of '' The Day The Earth Stood Still '' and '' When Worlds Collide '' , plus a continuous two-day-long party in Room 770 at the St. Charles Hotel that became legendary following the convention not only for its duration but for its high quality . Mike Glyer 's long-running newszine '' Hugo Awards were not presented at this Worldcon as the awards were not proposed until the following year , 1952 , with the first Hugos actually presented in 1953 at the 11th World Science Fiction Convention . However , in 2001 at the 59th World Science Fiction Convention held in Philadelphia , a set of Retro Hugo Awards were presented to honor work that would have been Hugo-eligible had the award existed in 1951 . A " Certificate of Merit " was presented to representatives of '' The Day the Earth Stood Still '' by the Nolacon I chairman , and this was reported on Movietone News at the time
11th World Science Fiction Convention
11th World Science Fiction Convention
9th World Science Fiction Convention