To give you and idea on how big Air Venture is and why during it its considered the largest airshow in the world with the busiest control tower. This is some of the stat's from this years air show released to the public
"Quote" More than 10,000 aircraft arrived at Wittman Regional Airport in Oshkosh and other airports in east-central Wisconsin. At Wittman alone, (Wittman airport is the Air Venture Airport) there were 17,223 aircraft operations in the 10-day period from July 21-30, which is an average of approximately 123 takeoffs/landings per hour.
"Quote"
Attendance: Approximately 590,000, an increase of five percent over 2016.
Camping: More than 11,600 sites in aircraft and drive-in camping accounted for an estimated 40,000 visitors throughout the week.
Commercial exhibitors: 881.
Forums and Workshops: A total of 1,050 sessions attended by more than 75,000 people
Total showplanes: 2,991 (up 5 percent over 2016): 1,107 homebuilt aircraft (second straight year over 1,100), 1,162 vintage airplanes (up 12 percent), 351 warbirds, 168 ultralights and light-sport aircraft, 79 seaplanes, 54 rotorcraft, 60 aerobatic aircraft, and 10 hot air balloons
All the rest are privately owned planes that show up in just about every make and model you can think of.