I want to know the answer to the following question:
What organization has produced annual masquerade balls in Oslo since 1988?
All the background I'm provided with is that "From 1863, the artist federation kunstnerforeningen held annual Carnival balls in the old Freemasons lodge, which inspired Johan Svendsens compositions "Norsk Kunstnerkarneval" and "Karneval in Paris".". Is that enough to answer the question?