A traditional Polynesian dance known as "pe-i", typical to the island of Mangareva in the Gambier Islands group of French Polynesia. For more from French Polynesia, visit xdaysiny.com/
might be similar but this was indeed filmed in Mangareva. Here's a video I took from the Cook Islands >> ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RaUgOveNZhA.html
it's not a real "tradional" instrument, it's what we call a Punu Sao, it's a metal box with Arnott's biscuit inside, people start using playing like a fa'atete because it got a nice metal sound
You can reach out to my friend Olivier Lenoir. He also doubles as a guide in Tahiti. He is a choreographer and is in touch with local dance groups >> www.iaoranatahitiexpeditions.com/en/home