Dayton Hamvention Calendar When: May 16, 2025 @ 9:00 am – May 18, 2025 @ 6:00 pm 2025-05-16T09:00:00-04:00 2025-05-18T18:00:00-04:00 Location: Greene County Expo Center 210 Fairgrounds Road Xenia, OH 45385 Website: http://Hamvention.org