The DCU Center in Worcester opened its doors for the first time since May for a ribbon-cutting ceremony to celebrate the upcoming opening and visit by Ringling Brothers and Barnum & Bailey Circus. Consigli Construction Co., Inc. is finishing up construction at the 31-year-old Center, with improvements to mechanical, electrical, and plumbing systems, along with an updated box office, four new suites, renovated rest rooms, and retail space. “The craftsmanship is excellent,” said City Manager, Michael V. O’Brien about Consigli’s work. The renovated Center will host over 100 events a year.