On March 6^th, the Limestone Student Society Entered into a Contract

On March 6^th, the Limestone Student Society entered into a contract with the "Stumbling Stones", a rock group, to give a performance at the Limestone University Students' Union on March 31^st. On March 29^th, the "Stumbling Stones" fell ill with the flu and were unable to travel to Limestone City. Another rock group was contacted by the Stumbling Stones to appear in their place and arrived at the Students' Union in time to perform. The contract, by its nature, is not subject to vicarious performance.