If opera festivals, a la rock festivals, have a headliner, it was La Bohème for the Opera Naples Festival Under the Stars this month. The beloved Puccini opera played to nearly full seating for two performances March 6 and 8 in Cambier Park. It was only part of the two-week festival, which brought in an estimated 4,500 guests, including Family and Community Day attendance, with an increase of 30% in ticket sales this year. Programs included The Luciano Pavarotti Foundation’s Pavarotti Voices concert, Mozart’s The Magic Flute and Gilbert and Sullivan’s The Mikado, all at Cambier Park. The festival included a Family & Community Day at Cambier Park and “Reflections from Nicoletta Pavarotti” at Wang Opera Center, where the finale last weekend was dance — Tchaikovsky’s Sleeping Beauty,