Please find following Links you may find useful:
Public Holidays
http://australia.gov.au/topics/australian-facts-and-figures/public-holidays
ATO Lodgment Dates
http://www.ato.gov.au/businesses/content.aspx?doc=/content/34949.htm&page=2&H2
Superannuation Information
http://australia.gov.au/topics/economy-money-and-tax/superannuation
Payroll Information