Award-winning actress and recording artist Idina Menzel, who is the voice of Elsa in Disney’s “Frozen” and won a Tony Award for her role as Elphaba, the Wicked Witch of the West, in the musical “Wicked,” will perform live at the grand opening gala for the $456 million expansion of the Baird Center on May 16 in the new Baird Ballroom on the convention center’s rooftop.