Dave Dennis was one of the organizers of the events that were launched in what month?
Dave Dennis (activist):  He grew up in the segregated area of Omega, Louisiana, and worked as co-director of the Council of Federated Organizations (COFO), as director of Mississippi's Congress of Racial Equality (CORE), and as one of the organizers of the Mississippi Freedom Summer of 1964. Freedom Summer: Freedom Summer, or the Mississippi Summer Project, was a volunteer campaign in the United States launched in June 1964 to attempt to register as many African-American voters as possible in Mississippi.
June 1964