Tuesday’s Democratic National Convention roll call to appoint Kamala Harris the party’s presidential nominee might have been ceremonial, but it was also a spectacle. Though the official roll call took place weeks before to avoid a legal battle over state ballot laws, the Democratic Party made the ceremonial a party, DJing individualized music for each state’s delegation and treating the crowd to surprise cameos from a variety of stars and celebrities. Onlookers were mesmerized by the performance, calling it one of the most energetic political convention showcases they had ever seen — including…