Ravalli County Fairgrounds Event Center Hamilton, MT Email Address: Ravalli County Fairgrounds Event Center 100 Old Corvallis Rd. Hamilton, MT Info: 406-363-3411 Region: Bitterroot Upcoming events at Ravalli County Fairgrounds Event Center May 15 Sat Bitterroot Gem & Mineral Show May 15 - May 16 Hamilton Ravalli County Fairgrounds Event Center Events Sports & Recreation Workshops