The Batumi raptor count in Georgia (the country, not the US state) does this kind of thing from August through the end of October each year. There's a migratory bottleneck over there that funnels all the birds through a narrow passage between the mountains and the sea. The teams count the migratory raptors during the day and also have lessons/seminars in the evenings. The fall 2025 season ended with over 1.5 million raptors counted