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Māori members of New Zealand’s parliament protested a bill about the 1840 Treaty of Waitangi, they started a haka to protest the first vote on a contentious bill that would reinterpret a 184-year-old treaty between the British and Indigenous Maori.
causing the session to be suspended

The treaty:
https://nzhistory.govt.nz/politics/treaty/the-treaty-in-brief

It was signed in 1840 by a representative of the British crown and 500 Maori chiefs. In exchange for ceding governance to the British, the treaty promised tribes broad rights to retain their lands and protect their interests.