Mr Peters' speech centred on the sacrifice of young New Zealanders in World War I and reiterated his party's staunch opposition to a change of flag.
"To throw out our current flag would be abandoning those young people who died for us and let's remember, they did not die serving under a flag that, sadly, so many foreigners think looks like a white feather on a faded washed out blue."
The second flag referendum finishes on Thursday, when a preliminary result will be announced.
The Electoral Commission has so far received 1.7 million voting papers, or 54 per cent of the voting population. This was already more than the first referendum, in which 1.55 million people voted.