enquirer – some of the possibilities are that the Executive Committee Secretary can postpone or cancel a General Meeting, notwithstanding that the Strata Manager has convened it under a delegation contained in their Agency Agreement with the Owners Corporation OR an adjournment may be called for at the Meeting itself by anyone in attendance there who’s entitled to vote.
A lot depends upon whether the mediated decision was issued as an Order (by a NCAT Adjudicator) or just as a written statement of the outcomes agreed between the parties.
A little more background information would help with more definitive responses!