29th World Science Fiction Convention
{'<entity_0>': '29th World Science Fiction Convention', '<entity_1>': 'Noreascon I', '<entity_2>': '1971'}
[['29th World Science Fiction Convention', 'inception', '1971'], ['29th World Science Fiction Convention', 'start time', '1971'], ['29th World Science Fiction Convention', 'alternative', 'Noreascon I']]
The <entity_0>, also known as <entity_1>, was held September 2–6, <entity_2>, at the Sheraton-Boston Hotel in Boston, Massachusetts, United States.
['Worldcon', 'science fiction convention']