The march, organised by the opposition HRPP party, follows two on Upolu in the last 10 days.
Village chiefs of Salelologa, the site of a hall planned as the centre of the protest, decided at a meeting yesterday to stop the march from entering their village.
Large rocks and logs have been placed to block the village entrance.
A heavy police presence is in place.
The prime minister Fiame Naomi Mata'afa has called for peace.
The decision by the village led to the HRPP party changing its plans.