The post received mixed reactions.
"Oh man, let the tamariki do their thing without the politics - this post is the very reason organising committee has 'banned' political parties. You've lost sight of the kaupapa already. Our kids especially those that hit that stage are already inspired, by their whanau/hapu/iwi, their kura and aspirational kaiako," one person wrote.
Another said they agreed with Mr Coffey's comments.
"We should take every opportunity to get our people informed. And enrolled. I mean, a lot of performances have political messages anyway. You'll not only get the rangatahi on board (hopefully), but their parents and wider whanau too, not to mention people from the smaller communities who we typically struggle to get to the nearest enrolment centre and who don't have internet access."
Speaking with the Rotorua Daily Post, Mr Coffey said he stood by his words.
"I acknowledge the hard work that goes into this event from the students to the committee and the volunteers. It was never our intention to steal the show, we just wanted to have a few flags and pamphlets.
"Our job is to get out to where the people are. We are at markets every week but not many people are going ... This would have been a great opportunity for us to engage with whanau.
"I still stick to what I said ... It's a missed opportunity."
Aramoana Mohi, chairwoman of Nga Pouako o Te Arawa, the organising committee of the event, said their focus was purely on kapa haka.
"Tamati has aired his views on Facebook and if we wanted to talk about it he should contact us directly.
"We are about promoting kapa haka and the expression of our art. This event is about celebrating who we are as Maori in a positive and uplifting way."
Ms Mohi said the Electoral Commission and Te Puni Kokiri - Te Arawa would have stalls at the event.
"We are making sure there is election information there, but just through organisations that have no party affiliation."
She would not say whether any other political parties or candidates had approached the committee to set up a stall.