Matt

True, but most of the people who would go to an ICP concert have probably already been disowned by their friends and family.

Draven

This. He made it there and played the show. Others apparently made it too. I'm assuming people that have the ability to make their own decisions with regards to the weather. If you chose not to go, you get your money back. If he had outright cancelled, I'd think there would have been plenty of people en route who wouldn't know that.