Australia Day festivities on Wollongong Harbour's foreshore will begin at 8am and culminate with a fireworks display at 9pm.
An action-packed Australia Day program will stretch along Wollongong Harbour's foreshore on Saturday, with everything from firing cannons to circus displays.
But police are warning clowns of a different kind that the consumption of alcohol and antisocial behaviour won't be tolerated.
"It's a family day that's not to be ruined by a few individuals," Superintendent Stephen Hegarty said.
"We'll be fair but firm; we won't be tolerating any dangerous, criminal and antisocial behaviour.
"We want to make sure everyone has fun, and not at the expense of another person's safety," he said.
Officers would ensure the alcohol-free event was enjoyed sensibly.
"Police have the power to confiscate and dispose of alcohol without warning, and that's what we'll be doing," he said.
The celebrations begin at 8am and culminate with a fireworks display at 9pm.
"They're always a highlight for the families who line the foreshore area at Flagstaff Hill and along Cliff Road for a bird's eye view," Wollongong Lord Mayor Gordon Bradbery said.
"New Year's Eve was brilliant and we expect this to be even better," he said.
Extra Gong Shuttle services will operate and those looking to drive to the celebrations are being asked to use the "park and ride" service.
No camping is permitted along the foreshore, including at Stuart and Galvin parks, which will be patrolled by council rangers and police.
Shade structures are permitted during the day but need to be removed before the fireworks.
Those partying across the state are also being urged to play it safe, with thousands of additional police to be deployed as part of Operation Westchester.
The high-visibility policing strategy involves general duties officers with assistance from specialist commands including highway patrol, the riot squad, mounted police and the dog unit.
For more information visit wollongong.nsw.gov.au.