Problem: A midwestern school district approved a policy allowing open access to its facilities by the public as long as public use did not interfere with school activities. The community has a history of deep religious convictions. A group of graduating seniors and their parents arranged for a baccalaureate ceremony sponsored by the community. The ceremony was to be held in a school gymnasium. Verbal authorization was granted by school district officials. One month later, the district approved a new policy that prohibited the group from using the gym. Does the district have the right to change its policies after giving verbal authorization for the use of the gym? Why or why not?