The Last Green Valley is asking residents of the 35-town region to join in the third annual Green Lights promotion, which begins Jan. 15 and runs through St. Patrick’s Day.

“Green Lights is for everyone,” Executive Director Charlene Cutler said in a news release. “We encourage not just our local businesses and towns, but also all of our residents to show their pride in our National Heritage Corridor by changing at least one light bulb to green.”

The purpose of the event is to remind visitors and residents of the resources of The Last Green Valley, the region of the Quinebaug and Shetucket National Heritage Corridor in Connecticut and Massachusetts. To participate, residents and business owners are asked to display a green light on their house or commercial building. Suggestions include: changing a porch light to green, hanging a strand of green LED lights around a window, displaying an electric candle with a green bulb. Green bulbs are available for purchase at local hardware stores. The Last Green Valley is also selling 60-bulb strands of LED lights $12. For information, call (860) 774-3300 or visit: www.tlgv.org.

The promotion will include an interactive map on the website showing where green lights are displayed, and a series of activities and events including lodging specials, snowshoe walks, theater performances and bonfires.