I am a member of the EAA and local EAA Chapter 1077, New Philadelphia, OH at KPHD.
EAAers are not unlike Teardroppers and can't wait for the next gathering to meet old and new friends. Airventure is fairly new name for an annual event (53 years) that the regulars most often just call Oshkosh. Airventure is the EAA's National Convention. It is the largest gathering of aviation enthusiasts in the world and people from all over the world attend. There is an airshow every afternoon and an airplane of some type flying all day long. Last year the USAF Thunderbirds were there. On Wednesday and Saturday there is a Night Airshow where the airplanes fly with fireworks coming off them and a fantastic regular fireworks display afterward. You sit on your own chair with no physical fence between you and the runway less than 150 yards away and you can take your own snacks. During the day you can walk through thousands of airplanes of all types from homebuilts to Warbirds. Hundreds of thousands of people attend during the week but it doesn't feel like it because they are spread all over the grounds.
As far as the camping goes, It is on a first come basis but I have never seen a time when you couldn't find a spot. (no electric) You may not be close to the show grounds but a bicycle ride of 5 minutes will get you there. The shower houses are well maintained and have a few flush toilets but there are port-a-johns all over the place that are kept clean all week long. I actually prefer to use them most of the time. Motorized vehicles are permitted in the campgrounds but nothing other than handicap vehicles are permitted inside the gate. There is a three day minimum and they charge you from the date of arrival to the end of the event ($26 per night). If you leave early you are reimbursed later for the remainder of the days after three. Trust me it's not hard to stay at least three days. There are three different waves of people that come. First the early group, then the all week long group comes. Most stay until Thursday morning so as to take in the first Night Airshow. The last wave comes in Thursday and stays until Sunday.
See You In Oshkosh!