It was an outdoor event, was it not? Is there not always the remote possibility that a cancellation or postponement will happen when it is out-of-doors?

Think if you drained your savings to cross an international border during an extreme weather event in the hopes of seeing a show.....
I empathize for sure, but you're rolling the dice on that. Also, we never know who made the final call on it. The band may have had little to say about the decision, it may have been made for them.