It's much easier for princess Astrid to attend royal events in Oslo as she lives there herself, than it is for princess Ragnhild as she lives in Rio de Janeiro in Brasil and have done so since she got married in 1953.Princess Astrid, is a part of the Royal Family, you can see it in the web. But the other sister, Princess Ranghild doesn´t attend events.
As for the Swedish princesses, princess Margaretha doesn't like to be in the spotlight and she has lived in England since she married in 1964, princess Birgitta have lived in Germany since 1961. Princess Désirée have attended royal events now and then but she lives 3-4 hours drive from Stockholm, and being busy with her own family and being mistress of Koberg castle.