You need this authority to conduct a raffle or lottery (an art union) to raise funds for a non-profit organisation. An art union is a lottery (for instance, a raffle) where the total value of prizes exceeds $30,000. Prizes are distributed by a draw of tickets or marbles from a barrel or other receptacle, or by an electronic device.
A non-profit organisation is a body of persons which is not formed for private gain (for example, charities, sporting clubs, social clubs, registered clubs, political parties, trade unions and incorporated associations).
If you are unsure if your community gaming activity requires an authority, you can use the community gaming check tool.