The Hopkinton Trails Committee has added a midweek trail workday for Monday, May 12, at 10 a.m. to construct a boardwalk to link the southern end of the Center Trail to the Chamberlain Street extension. Participants are asked to bring cordless drills with T25 bits if possible. The meetup spot is at the trail entrance on Chamberlain Street. For more information, visit hopkintontrailsclub.com.