I think the participation of young people in this possible referendum would depend on an information campaign. The Chief Electoral Officer could join with youth groups, youth forums, and promote participation in the referendum. Perhaps he could visit CEGEPs and universities to explain the debate to those who aren't following it.
That might also mean that there would be more young people working as election officials. Before the last federal election, the Chief Electoral Officer said that he would leave more room for young people. Yet we've heard about young people who applied and didn’t get a job.
If young people are part of the electoral process, they can be more informed and might be more aware of the referendum.