I see on the EAA site G.A. Parking is reported full, accepting no arrivals presently. The G.A. Camping area is reported 99% full.
I take great as good news, some vendors mentioned attendance was on the weak side. Has it filled up in the last few years? I'm sure there is ebb and flow as early birds depart. Of course the outlying airports like Fond Du Lac and others are available.