It’s 7 p.m. and Kelsea Ballerini is on stage with a crowd of 11,000 fans filling a stadium for the first time in her career. After a decade in the industry, Ballerini has become a household name, rising to Taylor Swift levels of fame, and often reaching a similar fan base. On Feb. 19, a sea of young women in denim and sparkles made their way to Newark’s Prudential Center to see the “Legends” singer live in concert.