Sensible Sentencing Trust founder Garth McVicar said Moko's death must not be in vain.
"Sensible Sentencing plans to mount protests outside every High Court in the country on June 27, the day [Shailer and Haerewa] are sentenced for the reduced crime of manslaughter in the High Court at Rotorua."
Mr McVicar said for those not able to make it to the High Court at Rotorua, there would be protests at their local High Court.
"We want to send a clear message to the Government by getting tens of thousands of signatures on a petition calling for an end to a system that not only allowed but facilitated Moko's heartless and evil killers receiving much less than they deserve."
Meanwhile a Facebook page, Protest, has been set up in light of Moko's death, with the aim of getting justice for abused children in New Zealand.
The page has gaining more than 1000 followers in three days with many people expressing their outrage of Moko's fate.
The page's creator and moderator Bevan Potter said the manslaughter plea was "outrageous".
"I want people to know we won't tolerate this. We are highlighting this issue because enough is enough."