There's a giant jelly fish looking net near Town Hall as part of Art & About Sydney. Check it out , as it's visually stunning to stare at while tipsy on a Friday night.
I think it looks more like Calcifer from Howl's moving Castle.
The correct term is 'mid-autumn' festival and it's a day where we stuff ourselves with moon cakes (light soft crust enveloping lotus seed paste and salted egg yolk). NOM AND FAT.