EAA AirVenture is a yearly air show held at Wittman Regional Airport in Oshkosh WI. It’s a gathering of aviation enthusiasts, arranged by the the Experimental Aircraft Association (EAA). The show last a week, usually beginning on Monday of the last full week in July. During the gathering, the airport’s control tower is the busiest in the world.
Please visit EAA’s Main website for more information about AirVenture. https://www.eaa.org/airventure