Billy is an experienced and popular singer in Brisbane. He contracted with organisers to sing at the Town Hall at 10 pm on 31 December. A term in the contract stated that Billy would be in Brisbane two days before the show so that he could rehearse, test the facilities and assist the Town Hall's publicity for the show. Billy arrived at the Town Hall at 9 am on December 31. The organisers advised Billy that they had terminated the contract. Were the organisers entitled to terminate the contract?