I would add two nuances to your question.
First of all, I was mainly thinking of human resources management services within Canada that support the selected candidate. Interviews are often conducted virtually. Once the candidate has been chosen, made an offer and accepted it, there’s a whole process to support them and bring them to Canada. Some school boards will travel to these fairs, but not the majority: of the 29 school boards that make up the Fédération nationale des conseils scolaires francophones, only 6 or 7 will go.
Secondly, in my experience, even if there’s a mistaken belief that information is easy to find, I often see a lack of understanding of the Canadian system. When people stop by the kiosk, the first question I ask them is whether they have determined where they will settle in their immigration plans. Some tell me they’re thinking of Ontario, the Northwest Territories or Manitoba. You understand that they have no idea of the distances between Canada’s various regions. If they’ve chosen to settle in one province and then decide to move, new steps must be taken, since Canada is a federation.
So they often need to be reminded to finalize their immigration plans properly. It’s to their own advantage. It will save them a significant amount of trouble and red tape. As you say, there’s information available online. In fact, we do a significant amount of website referencing, and when we do, we see very high traffic. Despite this, there’s still a lack of understanding of the Canadian system.