"It has been awesome the way all of us fighters have supported one another. My trainer [Todd Wilson] has been great too.
"Hopefully I can utilise and not brutalise his advice," Tamati said.
When the father of a 3-year-old daughter was asked what he believed his biggest strength was Tamati, who is likely to weigh in at 90kg, 10kg less than Tawhai, replied: "The vocal support from my whanau. My sister is due to have a baby during the next week or so ... she might get excited and have it on the night," he joked.
Tawhai, a long-time supporter of the annual event, will also be boxing for the first time in the bout which is scheduled for three two-minute rounds. The Patrick O'Brien-trained Tawhai has a background in martial arts and rugby.
"I've been struggling a bit with my training because of whanau commitments," the father of three boys aged 14, 12 and 10, said.
"Like Damon I'll be relying on the support of whanau to encourage me and help compensate for the lack of training."
While O'Brien and his wife Theresa, who organise the annual event, have been asking Tawhai to fight for a while he didn't hesitate when he heard this year's charity, The Key To Life Charitable Trust, would benefit.
"I've experienced suicide in my job.
"We need to help our rangatahi realise suicide is not an option," Tawhai said.
Both Tawhai and Tamati intend to continue training after the event.
"That's also what this kaupapa is about ... having an active lifestyle," Tawhai added.
The feature bout will see Flaxmere-raised Sydney-based kickboxer Chris Johnson take on Whanganui's James Griffiths.