Your group owns a night club in downtown Toronto and for the 20th anniversary of your business your company decides to hire a famous Canadian singer to perform for two nights, during the weekend celebrations. The singer confirms his availability by email and the general manager of your nightclub in his reply confirms the details of the agreement - date, time, performance expectations and payment arrangements. However, three days before his scheduled performance, the club burned to the ground due to a fire started in the boiler room.

question

What are the rules of the Law of contracts that will be applied to this case?