Jim,

When I worked the Wings Over Houston show in 2003, I noticed that they
had a very effective portable signage system. This consisted of a
series of folding "sandwich-board" type signs made from 1/2-sheets of
plywood, OSB, etc. hinged at the top, with a short section of rope
attached to the backs to keep the signs from spreading open too far.
Both sides of the sign were painted white. In foot-tall black letters,
the front of the sign simply said AIR SHOW. Under this was a large
plywood arrow painted day-glo orange. It was bolted to the sign at its
center so that the arrow could be pointed in the proper direction by
the sign crew no matter where the sign was placed. Simple and to the
point. Of course, there were a few other more specific signs like AIR
SHOW VENDORS, PARKING, GATES / TICKETS, EXIT, etc.

This type of sign could be made by a troup of Boy Scouts for under $15
each and would probably last a few seasons. And since they are fairly
small, they could be placed on the side of the road at critical
intersections on the days of the event, and then quickly removed,
provided the county sign Nazis would grant a waiver for the event days.

Just a thought.

Harry