Since a trade show or exhibition is held for a period of several days or weeks only, an exhibitor's agreement for space at such exhibition would not ordinarily have to be in writing in order to be valid. (Statute of Frauds does not require contracts to be in writing that are to be performed within one year). It is advisable, however, that the agreement be reduced to writing, in order that the rights, duties, and liabilities of the parties can be clearly fixed.