What were the causes & effects of the 1938 Day of Mourning?

This is a source-based homework task to support student understanding of the NSW History syllabus for the Australian Curriculum. It can be taught as part of:
Stage 5
Depth Study 4: Rights & Freedoms 1945-Present (as background stimulus)
Depth Study 6: School Developed Topic - The Great Depression
It can also be used to support student understanding of:
Stage 5 Aboriginal Studies - Topic 9: Aboriginal interaction with legal & political systems
Stage 6 Aboriginal Studies - Preliminary course Part II - Heritage & Identity
Students analyse a variety of primary and secondary written and visual sources to gain an understanding of the causes and effects of the 1938 Day of Mourning - a public recognition of the damage that European invasion of Australia had on the indigenous Aboriginal and Torres Strait Islander peoples of Australia. It was timed to coincide with the non-Aboriginal celebration of 150 years since the British set foot on the shores of Botany Bay and claimed the land for the British Crown. But would non-Aboriginal Australians get the message?