Can my employer force me to attend a mandatory meeting if it is scheduled during hours that the business is not open?

Question Details: I work for a supermarket chain and work part-time. I have given them written documentation as to the hours which I am available for work and it was approved and signed by a manager of the store. Now they are having a mandatory meeting that is scheduled at 6:30 am when the store isn't even open for business and are telling me that I have to attend. My normal shift is during the evening anytime after 4:00 pm. Am I required by law to attend?

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