Reflecting on his 25 years of annual Christmas Jam benefit concerts, Warren Haynes says there’s been “too many highlights to list.” The event’s grown from a small concert at the now-defunct 45 Cherry nightclub into one of the city’s biggest entertainment events, held this year on Friday and Saturday, Dec. 13-14, at the U.S. Cellular Center. With proceeds going to Habitat for Humanity, the shows are meant to celebrate Asheville’s philanthropic and artistic values, says Haynes.