An easy and affordable way to make a maze on a paved surface would be to use 5 gal. buckets filled with concrete, holding up 8' tall posts (2x4's). You can then tie the 2x4 posts together with furring strips for stability and stapling surfaces. For the walls, you can staple heavy black plastic to the uprights and cross members. As long as you have cross members sufficiently spaced across the tops of the halls and between the uprights, the whole structure should be quite stable, even in light to moderate winds. Since the top is open, you should not have any fire marshal concerns. It is a bit of work to get the buckets and uprights put together, but they will be reusable year after year. The furring strips used to stabilize the walls can also provide mounting surfaces for lighting and sound.
Just be sure that the major scares are not in confined halls, as the plastic will not hold back a stampede.
We have successfully used this system with the haunted barn portion of our hayride for 16 years.
Eric
Just be sure that the major scares are not in confined halls, as the plastic will not hold back a stampede.
Eric