I want to know the answer to the following question:
On what date did the Mau demonstrate on the streets of Apia?
All the background I'm provided with is that "In accordance with the Mau's non-violent philosophy, the newly elected leader, High Chief Tupua Tamasese Lealofi, led his fellow uniformed Mau in a peaceful demonstration in downtown Apia on 28 December 1929.". Is that enough to answer the question?