Police seized the drugs from vehicles they stopped coming and going from the weekend Harvest Fest sponsored by the marijuana advocacy group.
Police also seized other drugs, including speed, Ecstasy, mescaline, cocaine and prescription medications, and made a number of arrests.
Harvest Fest was held at a farm in Starks, where participants camped out and listened to bands. It was sponsored by Maine Vocals, which advocates the legalization of pot.
Special police details that included a drug-sniffing dog were assigned to the event. All told, at least 150 vehicles were stopped. Among those arrested were two men who allegedly bought two pounds of marijuana at Harvest Fest which they intended to resell.