New Zealand Law
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The answer is in the Unit Titles Act which says to the chairperson, although I would also give a copy to the secretary as well
90 Who may call general meetings
(1)An annual general meeting must be called by the chairperson in accordance with the regulations.
(2)An extraordinary general meeting of a body corporate—
(a)must be called by the chairperson in accordance with the regulations if a notice asking for an extraordinary general meeting to consider and decide motions proposed in the notice is—
(i)signed by or for the unit owners of not less than 25% of the principal units; and
(ii)given to the chairperson; or
(b)may be called at any other time by the chairperson or the body corporate committee in accordance with the regulations.