Removing cannabis arrests and investigations from the workload of police would free up officers to deal with far more serious crimes, Mr Bollard argued.
Police national command and emergency management manager Inspector Nick Brown said police respected people's right to lawful protest.
"Police are aware of the planned protest action, and we will have the appropriate resources at each event across the country to deal with any issues that may arise.
"Police as an organisation is well practised in dealing with these events, and our staff will work to ensure an effective response is provided based on the circumstances at the time."