Personally, I think a certain level of this stuff should be acceptable, but it should also be evenly distributed.
Not just to poor Aborigines, but also to poor white people and such that are not doing too well. Even if it is being distributed fairly, no big deal should be made out of helping the Aborigines. Its not some incredibly honourable action, that is worthy of praise for showing 'Equality' - its something that should just be done anyway.
The school function I can understand, often ethnic groups can feel more secure when surrounded by kin rather than others, but it all depends on the attitude the Aborigines at your school exert. If they are aloof and don't talk too much to white people, or seem to have problems of some kind in that area - its a good thing. If they're just like normal people, and don't really care who they hang out with, then I see no reason for it.
Honestly, forcing any kind of diversity seems wrong. Everyone is different, and different cultures and races will be better at different things [In general] than certain other cultures and races, but no big deal really needs to be made out of this. We're all one nation, we're not a bunch of separate ones. We are not "Aborigine Australia", "White Anglo Saxon Australia" and "Other ethnicity [Sorry, but I'm not going to list every ethnicity that lives in Australia. I'm not trying to be racist, but I don't really have all the time in the world ATM] Australia". We are simply "Australia". All of the above combined into one. As such, there really is no reason to encourage any increase in racial diversity. Treat everyone the same, and people will begin to feel the same. Help all poor people with the exact same benefits, don't focus on any one minor group. That just encourages an "Us" and "Them" mentality, by giving "them" special treatment over "us".