The caveats of riding someones coattails

I'm sure that this would not fly. In our area, a common thing to see is CEAR events at Home Depots. They have an agreement with Home Depot, and you would actually be on private property as well. You wouldn't last long set up there.

Also, keep in mind these collection events are usually fund raisers for non-profits.

Now, if you were on another property, that would be different. I'd suggest having required permits and licenses for this though.