Try these websites..
KidRex a search engine
http://www.everyculture.com/wc/Mauritania-to-Nigeria/New-Zealanders.html
Celebrations:
http://www.express.co.uk/news/world/763781/Waitangi-Day-New-Zealand-celebration-holiday-date-what-is-when
https://www.kiwifamilies.co.nz/topic/grown-ups/festivals-grown-ups/
http://media.newzealand.com/en/events/celebrating-new-zealands-waitangi-day/
https://nzhistory.govt.nz/culture/holidays-and-events
http://www.wicked.org.nz/Interactives/Maori-themed-interactives-in-English/Matariki
Food:
http://media.newzealand.com/en/story-ideas/kai-traditional-maori-food/
http://www.newzealand.com/int/feature/favourite-new-zealand-foods/
http://www.backpackerguide.nz/17-unique-new-zealand-foods/
https://www.brenontheroad.com/new-zealand-food-what-people-eat-in-new-zealand/
http://www.wicked.org.nz/Interactives/Maori-themed-interactives-in-English/Hangi
https://www.youtube.com/watch?v=N-b_APbf-GQ
Clothing:
https://teara.govt.nz/en/maori-clothing-and-adornment-kakahu-maori
http://www.thehakashop.co.nz/products/traditional-clothing/
http://www.new-zealand-vacations-in-west-auckland.com/maori-clothing.html
Art/Dance:
https://www.newzealand.com/int/feature/kapa-haka-maori-performance/
https://www.newzealand.com/int/feature/ta-moko-maori-tattoo/
https://www.newzealand.com/int/feature/maori-arts/
https://www.youtube.com/watch?v=gT62N19PZSs
https://www.youtube.com/watch?v=nxm31nQ2_1k
