Yes, a simple majority decision by the EC or, failing that, the combined written and signed request by owners holding at least one quarter of the unit entitlements in the building.
This is what the Act says:
Division 3 Special provisions relating to procedure for meetings other than first annual general meeting
31 When general meetings of owners corporation are required to be held
(2) A general meeting of an owners corporation (in this clause referred to as an extraordinary general meeting), which is not an annual general meeting, may be convened by the executive committee at any time.
(3) The secretary of an executive committee or, in the secretary’s absence, any member of the executive committee must convene an extraordinary general meeting as soon as practicable after receiving a requisition for such a meeting signed by one or more persons entitled to vote in respect of one or more lots, the unit entitlement or the sum of the unit entitlements of which is at least one-quarter of the aggregate unit entitlements.
'As soon as practicable' means given enough time to send out notices and agendas and organise somewhere to hold it. It doesn't mean when it's convenient for the secretary, chair, or strata managers.