I agree with JT. I had suggested that you could get an order from the Tribunal to cancel the meeting due to irregularity but given the time-frame, I prefer JT’s advice. See if it goes ahead, document the multitude of errors and in your own time, with some allies, get an order from the Tribunal to render the whole lot null and void and of no effect.
All I would do tomorrow morning is phone the strata manager to let them know that if this goes ahead on their watch it will be very embarrassing for their business. The strata manager might turn out to be an unexpected ally. They might have been trying to give good advice but done as they were instructed by the committee and hoped to wash their hands of it. If they see that things are about to hit the fan, they might be more insistent about their advice to the committee.