It's the opening weekend of the annual Eastern States Exposition and officials have new security measures in place at New England's largest agricultural fair.
Visitors will have to pass through metal detectors, 25 of which have been placed at the entrances to the Big E.
Security towers also have been erected around the fair to give law enforcement a better view of the grounds.
In-depth news coverage of the Greater Boston Area.
The moves are in response to mass shootings across the country, including the July shooting at a garlic festival in Gilroy, California where a gunman killed 3 people and injured 17 and the Sept. 3 shooting that left three people injured outside the Minnesota State Fair.
More than 100,000 people are expected Saturday at the Big E, which runs through Sept. 29.