Dayton Hamvention Calendar When: May 15, 2026 @ 9:00 am – May 17, 2026 @ 6:00 pm 2026-05-15T09:00:00-04:00 2026-05-17T18:00:00-04:00 Location: Greene County Expo Center 210 Fairgrounds Road Xenia, OH 45385 Website: http://Hamvention.org