Exempt Development?

As per the comments on temporary use, state planning acts often have sections on Exempt Development which, on occasion, can mean a small theatre or gallery being set up in a disused warehouse or old shop front doesn’t have to seek full compliance as a Class 9B place of public assembly. The application of this sort of rule seems to hinge on the whims of local council, but it’s worth looking in to for your state and local government area – start by wading through your local council’s development and planning documents (which will be on their website) to see if there’s any info on how they apply it.