The MetaScrum is the meeting where all decisions product are made and/or heard by representative decision makers from all areas of the company. Typically this is a weekly meeting run by the Master Product Owner and supported by the CEO. The agenda includes a charter of meeting rules, objective, current sprint status update and upcoming sprint plan. Depending on the company culture, more items may be included that impact the product release cycles. One of the most important rules to enforce is that all priority order changes must be made in the meeting and supported until the next meeting. These meetings can be critical to helping the product management and development teams focus on getting things.
I will be posting links to sample formats and documentation.