Volunteering and dugnad
Dugnad is unpaid communal work: neighbours painting a shared area, parents tidying up a schoolyard, a sports club running a kiosk at a tournament.
It's one of those Norwegian words that doesn't translate well, and it's one of the things people most often wonder is compulsory. It isn't, but showing up matters socially.
Why it's in the curriculum
The curriculum has its own competence goal about social conventions and about taking part actively in social settings. Voluntary organisations, sports clubs and parent committees are those settings, and they're also where many people learn Norwegian fastest.
The curriculum also has a separate goal about using different settings to learn Norwegian. The two are connected: dugnad isn't just about being sociable, it's language practice that costs nothing.
In practice
Nursery, school, housing co-operatives and sports clubs are the most common places you'll come across it. Turning up once usually gives you more Norwegian conversations than a week in the classroom.
