One would think if she's already done the booking, etc., that would be completed work, and should be paid for.
There has GOT to be more to this story. Why would an event planner get the heave-ho right before the biggest event-week of the year?
My gut tells me...
The owner lost money on 5 previous events. I'm guessing that he foresaw losing money on next weeks event. So, he got rid of her to keep 100% of revenue.