I'm really intrigued by this. Are there "seasons" in a course design? (We do talk about things being "hot" or "cooling down", of content "coming down in buckets"...) That's a season which teachers (and to an extent students) can control.
What about the seasons of a learner's life - and not just in terms of chronological age, but of life stages?
We know there are curricular "seasons" - again, in terms of heavy and light workload times, new student arrivals and graduations of students as they finish, faculty retirements - but do we address these as liminal times of our shared culture, or just as scheduling hassles?