It varies by debate and by the subject. Some of them are hyper-local, about the issues in a particular community. It might be some from that community who are interested. However, especially with the petitions, some of them can be issues of national significance. The main element there is the responsiveness so that it allows for citizens to be brought, and their concerns to be brought, into the chamber in a more direct fashion.
If it's something put forward by a backbench member, particularly if they have constituents who have been campaigning for a particular issue, they can notify them to tune in and be able to see a bit more of a dynamic response as compared to here where you might get an S. O. 31, a member's statement on a particular issue, but you make your statement and there isn't the response in the same fashion.