Whether it was the cooler weather or some other factor, Foxborough police had an easier time this year at the New England Country Music Festival on Aug. 23 and 24, escorting two-thirds fewer people into custody than last summer’s two-day event at Gillette Stadium. Officials described behavior at the concerts with headliner Kenny Chesney as a vast improvement over last year — with just 89 arrests and 179 protective custodies, mostly for public drunkenness. In 2012, more than 600 people found themselves in police custody. Foxborough Police Chief Ed O’Leary said weather and collaboration with other law enforcement agencies helped decrease the number of incidents. Parking lots also opened later than in previous years, allowing cars in only at 2 p.m. for the 5 p.m. concerts, which cut down on tailgating time, officials said.