Abstract: A hinge assembly for use with an expandable performance platform that allows relative independent pivotal movement between its first or extension panels and its adjacent second or base panel. The hinge assembly allows the extension panels to lay atop the base panels for storage or transport by providing movement of the pivot axis as the extension panel is pivoted. The hinge assembly also provides a flat performance area with a minimum of gaps along its abutting edges when the extension panels are in a performance mode.