Definitely early Monday afternoon. That was the day I moved my plane out to the show area from the N40 and it was only there for the day. It is in this picture in the show area and I moved it back to the N40 as soon as the airshow ended. Looks like just before the airshow started with people setting up their viewing perches along the flight line and all the airshow planes are staged ready to go. There are a few RV's taxing in so obviously the airshow had not started yet.
My empty spot in the N40 with my canopy cover holding my spot: 43.989715, -88.566811 and my RV in the show area: 43.986138, -88.563696
(to get your coord on map, right click on your spot, select Drop Lat/Long Mkr, highlight then copy coord w/ Ctl V, paste as desired)