The International Holistic Health Cannabis Convention Halloween Harmony & Harvest Festival had been set for October 29-31, in the former home of the Detroit Lions.
Officials in Pontiac, Michigan, had been concerned about security.
Pontiac Silverdome exec Grant Reeves tells The Oakland Press organizers have decided to move the event.
He didn't say why. Organizers of the cannabis fest now say it will held next year at Cobo Center in Detroit.