Oshkosh Air Venture Camping?

I camped there with no reservations. They have full hookup sites and I'm sure those require reservation and you have to pay for the entire week. I didn't even try to get one of those. We just took an open space in the field. I think that was back in around 2009 when we did that. Back then they had on the webpage that as long as you wanted to use overflow camping to just show up as it never fills up. I don't see that on their website now, but they had thousands of acres of grass fields when I was there in 09 and there was space for probably 500 more RV in the field I parked in which was actually the last field in the line. But I think they even had other fields they could have opened if the one I was in filled up.

We took our bikes with us and just road those to the gate everyday. They had a huge area for bike parking by one of the side gates.