Autumn Weather and Flexibility
With Autumn comes a change in weather. The days get shorter and the temperatures drop. Clouds come more often, and stick around. The result is that events that are scheduled are cancelled.
Today the weather was good, but the event is scheduled for tomorrow. In a situation such as this I would consider moving the event forward by one day, to take advantage of the good weather. It is a shame to stick to a day, when a shift is possible.