Ms Kumeroa said the school sent out notices to other schools in Hawera and was expecting other members of the community to make up numbers in the line.
She said there was support coming from all over the region.
Victoria University's School of Education lecturer Andrea Milligan said there could be education benefits for children taking part in protesting.
She said observing and doing the same as adults was how children learned about being a member of society.
Dr Milligan said it was important for children to be given a chance to constructively contribute to society from a young age.
She said they could get a lot out of being part of a protest.
She said there was good evidence of children being able to think critically and carefully about issues in the community, that won't affect them but might affect others in society.
- Newstalk ZB