The event I'm thinking of was an open-air jazz festival in Durban, South Africa, where I live. It's usually held on a long weekend in September on the lawns by the beachfront, and I'd bought tickets months in advance with three friends from work.
Two days before it was due to start, the organisers announced it was postponed because of a severe weather warning. The forecast predicted gale-force winds and heavy rain along the coast, and they said the stages and lighting rigs couldn't be safely put up. The new date was announced for six weeks later.
At first I was really frustrated. I'd booked the Friday off work, and one of my friends had arranged for her mother to look after her kids. Online, a lot of people were angry too, and some claimed the organisers were overreacting because the forecasts are often wrong. But when the weekend came, the storm was genuinely bad. Trees came down near the beachfront, and part of a promenade was flooded. Seeing that changed my mind completely; if thousands of people had been standing in that field, someone could have been seriously hurt.
So my feelings went from annoyance to gratitude, and I think many people felt the same once they saw the news. When the festival finally happened, the atmosphere was even better than usual, perhaps because everyone had waited longer. It taught me to be a bit more patient with decisions that seem inconvenient at the time, because the people making them often know more than we do.