Well, it's scheduled to be held at the Master Gardener Test Garden, so the walkways are just lawn. But it seemed fairly firm and even this weekend.
Here is a map of the site. The parking area is the large square parking area at the lower part of the map, not the one on the left where the cars are.
https://maps.google.com/maps?h...
Editing this to say that I believe the spring sale will be held in the hanger about 300 yards away on the same street and it is all paved.
