If we're going to save the summer 2021 festival and event season, a big chunk of the population would have to be vaccinated by the summer. You mentioned the Calgary Stampede, which takes place in July. That's just it. Being a northern country, we tend to hold our festivals and events between June and August. That would mean that as many people as possible would have to be vaccinated before the summer if we are going to have anything resembling a “normal” season in 2021.
On December 1st, 2020. See this statement in context.