And, simply because a store owner says your demo is OK doesn't make it so. Bring open carry rifles or handguns, even if they are black powder, into a restaurant and I personally know some people who would be scared, and others who would be angry. They don't typically have discussions with store management about such things before they sit down. At a really basic level, I for one don't want to be bothered in a store or restaurant by any demonstrators, straphangers, peddlers, panhandlers, etc. Please, just go away!