Join Hancock County 4-H for Annual Jamboree Celebration Join the University of Maine Cooperative Extension in Hancock County as we celebrate our annual 4-H June Jamboree! This year, Jamboree will span from June 5th through July 11th and will feature at-home activities and in-person workshops for youth. 4-H June Jamboree is an annual event hosted read more Register now for Jamboree Celebrations!