It's an objective test. Where children can reasonably be expected to be present is a qualified, objective test, and so the courts will look at a person in the position of the accused, whether or not that person would have known that children could reasonably be expected to be present.
I recall the minister making a comment in his earlier remarks that a bar, for example, would likely not meet that test. As to whether or not another scenario would meet that test, that would be up to the courts.