I think it depends on the issue. With the Quebec referendum, for example, people often point to that and say that people will come and turn out if it's an important issue. We saw electoral turnout declining federally and provincially during that time, but everyone came out for the referendum. Sometimes municipally, when a question is on a ballot, more people come out.
It depends on the nature of the question. The Sunday shopping question got a lot more people out municipally. It depends on the nature of the question, issue salience, and how important it is to people.