Most people wearing Groucho Marx glasses

According to Official Guinness Records,

The most people wearing Groucho Marx glasses was achieved by 4,436 participants in an event organised by the City of Chicago's Outdoor Film Festival in partnership with the Goodman Theatre in Chicago, Illinois, USA, on 21 July 2009. The event started at 5:00 pm and finished at 8:33 pm

For a complete list of 2009 records, please visit 2009 Guinness Records in United States.

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