The secretary can go ahead and hold the meeting regardless, provided they send out the agenda to all owners one week (I think) before. You don’t need the strata manager to attend or even approve . You are the boss of the SM, not the other way round. If the SM refuses to send out the agenda – sack them. They aren’t doing their job.
The exception, of course, would be a statutory appointment manager, who may tell you there is no committee to meet.