(Gazette Photo by Rebeca Oliveira) U.S. Senate candidate Elizabeth Warren lends a hand to a quilting group volunteering for Room to Grow, a children’s charity, during to a day of service held in honor of Martin Luther King Jr. on Jan. 16 at the Curley School. Alan Khazei, founder of volunteer organization City Year and a Warren supporter, and his daughter Mirabelle looked on during the Boston Cares-organized event.