New liquor license laws are set to come into force at midnight, enforcing stricter trading hours for on and off-license premises.
Under the legislation, off-licenses will have to close by 11pm and on-licenses by 4am.
Police Assistant Commissioner Grant Nicholls said alcohol was a factor in about a third of all crime and police would be enforcing the new laws in the run-up to Christmas.
"We are serious about preventing harm caused by excessive drinking.
"Police expect those who sell or consume alcohol to take their responsibilities seriously too. Everybody should be able to go out and have a good time, without causing harm to themselves, others or the wider community."