What a ridiculous thing to suggest, that because it wasn’t Tom Jones’s fault that the electrics failed, therefore gillybob and all the others who paid for tickets and travel, and possibly accommodation, that they should pay and accept that it didn’t go ahead. Apart from the fact that the organisers have insurance against such situations arising, the company have made a contract with the purchaser when the tickets were bought, and the contract was that the buyer would be able to attend the concert. Should the buyer be unable to attend (illness, family crisis, clash of plans etc) then the buyer loses the money paid, but if the provider fails to provide the paid for service, for ANY reason (other than act on God, which failing electricity most certainly is not) then the provider is obligated to return the money or make new arrangements for a new event. The law protects!
And using the law to enforce legally binding contracts is not being a snowflake, it’s being sensible. You simply write a letter of intent to the provider asking for your money back, and telling them you will go to law (small claims court) and give them two weeks to comply, and surprise, surprise, they pay!