"We are just going to reconnect with some of those soldiers who never came home. It's really sad. Last year we went to Monte Casino, and it is an overwhelming feeling of emotion - all of those young New Zealanders and young Commonwealth soldiers, none over 25, they lost their lives in a land so far away from home."
Rahiri said the Māori Battalion was fondly remembered and well respected in Italy.
"After nearly every performance last time we had some elders come up and people in the community come up [and talk about the Māori Battalion] because they helped save their town," he said.
Rahiri said Te Kapa Haka o Ngāti Ranginui would mainly perform "a lot of our older songs that are a tribute to our soldiers that are buried over there".
This includes Waiata-a-ringa Te Hokowhiti Toa, a dedication to those soldiers buried in Italy.
The group will be away for 21 days, 16 of which will be involved in the festival which ends on August 15.
Rahiri said New Zealand culture was popular in Italy.
"People love the haka and love the poi. I guess to the untrained eye a lot of their dances can look quite similar and I think the South Pacific offers something different."
Rahiri said the group was especially grateful for sponsors to help fund part of the trip.