Halfway through the Progressive Skating & Gymnastics Spectacular, Chyanne Larive and Jayde Engel of Lead were still in shock. “Is that the real Ashley Tisdale?” Jayde, 7, asked. Chyanne, 8, just gave a thumbs up. The “High School Musical” star, along with a cadre of Olympic and world champion gymnasts and figure skaters, kept a large, high-energy crowd equally happy Friday night at the Rushmore Plaza Civic Center. Thanks pseudovirus!