Most balls released

According to Official Guinness Records,

The most balls released simultaneously is 10,000 at the Mega Pic-Nic 2010 organized by Realizar Eventos Especiais and Modelo in Parque Eduardo VII, Lisbon, Portugal, on 5 June 2010.
The record was broken in addition to "Most people wearing red noses" at the event, which attracted more than 110,000 people in what what was a daylong send-off to the Portuguese men's national soccer team before the 2010 FIFA World Cup. The net held 20,100 red balls but it was determined that only 10,000 were released in the alotted time period.

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

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Other Portugal records that might interest you:

• Most seafood prepared at an outdoor event
• Oldest operating bookshop
• Fastest half marathon (male)
• Most hair dyed in 24 hours - single location
• Most appearances in the cycling Tour of Portugal