Last week, I went to Southbank and visited the ARCADIA in Culture Forecourt. I was in there at afternoon, so there were not many people and a bit quiet. I think that will be better in the evening; the food stalls will open, and some live music performances will be on the stage.
Regardless, on this Saturday, there will be the closure of Brisbane Festival 2016. There will be som exciting events. For example between 3 pm and 6 pm, Aviation displays will be in Southbank. Moreover, Sunsuper Fireworks will be 7 pm in Southbank too! I think you should not miss that