"To see the online interest numbers reach 3000 has been absolutely astounding.
"When we first decided to do the march we were expecting a few of us to make the walk and stand outside the courthouse for the sentencing, now there are 12,000 people nationwide who have expressed their interest in marching for Moko."
Mrs Bentley said she was keen to hear what sentence the pair received and the reaction from the marching crowd.
"I think even if the judge gives the maximum sentence she can for their manslaughter charge, it's not going to be enough."
Those taking part in the march will meet at the Village Green at 9am. There will be a few speakers before the march travels down Fenton St and on to Arawa St, assembling outside the Rotorua court.
Members of the Rotorua Grandparents Raising Grandchildren support group will be among the marchers.
Field officer Sheree McKenzie said they decided to get involved to stand up against child abuse.
"We are there to show our support for putting our children first. We want to encourage others to stand up and spread the message that we shouldn't be silent when it comes to this issue."
The Ministry of Justice has previously told the Rotorua Daily Post it would not discuss if additional security measures were being put in place for the sentencing and protest.
However, a spokesman said they expected a lot of people would attend.