Have you actually read what you are writing. It is clear that you are quite emotional about having the event cancelled and is clouding your judgement. If you agree to the terms that were on the contract whether it be the captain or whoever they entered the whole team into that contract. Clearly you need to get your head around contract law and understand the notion of a tort. You can put anything you like into a contract as long as it doesn't break any laws or right. Then the onus is on the other party to dispute or strike out parts of the contract that they do not agree on.Mmmm, of course concerts provide full refunds as a matter of course, because dept of fair trading makes it abundantly clear that they must.
Incidentally, the only person that clicks on the I agree button for a Mont entry is the team captain who pays the money. The rest of the team would only see it if they searched first.
I hope they can move it, or held suitable insurance.
EDIT,
JD you cannot write any old T&C into a contract and rely upon it just because the other person signs it - it has to fulfill various provisions of fairness in common contract law and legislation, especially when one party has no power to change the contract - eg you don't get to choose your contract for a home phone connection, or an iPhone app, or any of. A million things you do day to day. But there are laws protecting you from over zealous companies writing the contract entirely to benefit them.
This thread has definitely made for an interesting read ...........................................