Quizzes included in a course that has not yet reached the start date provide an error message that is confusing. Example: 'This quiz is no longer available as your enrolment has been concluded'. The example implies that there is an issue with the enrolment for the student, which is misleading as the quiz is only not available because the start date has not yet arrived. This could cause traffic as the student may revert to the helpdesk for the provider, when there is no problem with their enrolment.
Solution: 'This quiz will be available once the course begins'. I propose this as it indicates clearly to the student there is no issue with their enrolment, merely that the quiz is to be unlocked once the course begins.