In conjunction with this weekend’s Spring Festival, Eversource and the Town of Naugatuck have joined together to host a free, town-wide light bulb swap for Naugatuck residents. Between 2 p.m. and 6 p.m., Naugatuck residents, with identification can exchange old, incandescent light bulbs for new, energy-efficient ENERGY STAR® LED bulbs. Additional LEDs and lighting products will also be on sale at a discounted rate. The Spring Festival is Saturday, May 20, from 2 to 10 p.m. on Church Street and Old Firehouse Road. The event features three bands on two stages, children’s activities, local food, drinks, an outdoor car show, craft vendors and more.