The Bridger Raptor Festival is an annual event held in early October in and around Bozeman, Montana. The festival, which is free to the public, centers around the largest known Golden Eagle migration in the United States. Since 1991 a raptor migration count has taken place every fall at the Bridger Bowl ski area in the Gallatin National Forest just north of Bozeman. Festival activities center around raptor viewing and include nature walks and talks, educational and entertaining programs and activities for people of all ages.
See the full schedule of event here: https://bridgerraptorfest.com/current-events