People in Denmark (and, I believe, Norway) celebrate carnival like Catholic countries in spite of Denmark being a country with a Lutheran state church.
However, Fastelavn is very different from the Brazilian carnival. It’s much closer to Hallowe’en: The kids dress us and they go guising from door to door. They also “knock the cat out of the barrel” (although no cat is involved any more) — you can see Anna taking part on the photo on the right — and eat special sweet rolls.
It’s a very sweet tradition, and I think Léon, Anna and Amaia really enjoyed celebrating it together with Danish kids in Denmark this year — although Anna was a wee bit surprised that all the other kids in the school group were much bigger than her (Danish kids start school two years later than here).