The Health (Public Buildings ) Regulations 1992 cover communty theatres and are applicable to public schools. http://classic.austlii.edu.au/au/legis/wa/consol_reg/hbr1992323/
This PDF document Guidelines on the Application of the Health (Public Buildings ) Regulations 1992 is much easier to read https://ww2.health.wa.gov.au/~/media/Files/Corporate/general%20documents/Environmental%20health/Public%20Buildings%20Guidelines%20Final.pdf
Model Code of Practice : managing the risk of falls at workplaces https://www.safeworkaustralia.gov.au/doc/model-code-practice-managing-risk-falls-workplaces
Concerts and Mass gatherings Guidelines pdf copy https://ww2.health.wa.gov.au/~/media/Files/Corporate/general%20documents/Environmental%20health/Concerts%20and%20Mass%20Gathering%20Guidelines.pdf
Electricity Regulations 1947 pdf https://www.slp.wa.gov.au/statutes/regs.nsf/(DownloadFiles)/Electricity+Regulations+1947.pdf/$file/Electricity+Regulations+1947.pdf
Guide to testing and tagging portable electrical equipment and residual current devices at workplaces Government of Western Australia Department of Commerce Worksafe https://www.commerce.wa.gov.au/sites/default/files/atoms/files/guide-testing-and-tagging-portable-electrical-equipment-and-residual-current-devices.pdf
Electrical appliances and equipment Importing, selling or hiring – Department of Commerce https://www.commerce.wa.gov.au/publications/electrical-appliances-and-equipment-importing-selling-or-hiring
Documents pdf copy https://www.commerce.wa.gov.au/sites/default/files/atoms/files/importing_electrical_appliances.pdf
Electrical Safety for Entertainers is a UK document that everyone needs to read and understand https://www.hse.gov.uk/pubns/indg247.pdf