Premature Movie Postponement?

Saturday night's outdoor movie at Southpoint Park was cancelled by RIOC due to fear of predicted thunderstorms. As we know the thunderstorms did not arrive and the movie could have been shown. We all know that 20/20 hindsight regarding weather predictions is worthless and that RIOC cannot be criticized for an incorrect weather forecast. However, RIOC can be criticized for making the decision to cancel Saturday night's movie on Friday afternoon. Why did RIOC not wait until Saturday morning or afternoon when the latest weather forecast could be evaluated before making a decision to cancel that evening's movie?