21st World Science Fiction Convention
{'<entity_0>': '21st World Science Fiction Convention', '<entity_1>': '02 September 1963', '<entity_2>': 'Discon I'}
[['21st World Science Fiction Convention', 'start time', '02 September 1963'], ['21st World Science Fiction Convention', 'inception', '02 September 1963'], ['21st World Science Fiction Convention', 'alternative', 'Discon I']]
The <entity_0>, also known as <entity_2>, was held August 31–<entity_1>, at the Statler-Hilton Hotel in Washington, D.C., United States.
['science fiction convention', 'Worldcon']