How much notice is required from a company before canceling a prepared class

Question

How much notice is required from a company before canceling a prepared class

Answer

? What is a "prepared class"? If you mean you were required as an employee to attend a class regarding your work and the company needed to cancel it, there is no law, but there may be some written company policies, or there may have been some directives about the class, or there may be a collective bargaining agreement, any of which may have created some expectation.