Yes, that is a large group, although not compared to total attendance at a major sporting event.
Of which ATL hosted two of those this weekend at the new Mercedes-Benz Stadium with football game Sat. & tonight. I stayed at that hotel for a convention that coincided with the SEC Conference football championship game in 2005. The place was filled with Arkansas Razorbacks and the sounds of "sooooo-eeee Pig! - Razorbacks!" echoed up the atrium.