Largest Halloween gathering

According to Official Guinness Records,

The largest Halloween gathering was achieved by 17,777 participants at an event organised by the New Orleans Saints and NBC Sports (both USA) at the Superdome in New Orleans, Louisiana, USA, on 31 October 2010.
The attempt was filmed as part of the nationwide broadcast of "Sunday Night Football" on NBC during which the New Orleans Saints defeated the Pittsburgh Steelers.

For a complete list of 2010 records, please visit 2010 Guinness Records in United States.

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