If you leave your tent standing, your tie down present and roping of your site to indicate your intentions to return you should be golden. Upon your return to AirVenture and if the N40 is full up be mindful that Flightline Safety may try to send you to the S40. Their primary focus is to expedite the flow of traffic off the active runways. A short verbal communications with the marshaller should get you moving toward your destination and a second placard, boldly written with your row number displayed will greatly assist in arriving back to your site. The folks working Flightline Safety are all volunteers and for many it is their first year volunteering, guided by a mentor. It's amazing how well everything flows considering all they have are placards and hand signals to move thousands of people and planes each year. Patience, understanding and a smile work wonders.