Freemasons from John Warren Lodge, 6 Main Street, Hopkinton, will open their doors to the public on Saturday, Oct. 15, from 9 a.m.-3 p.m. More than 200 lodges across Massachusetts will be hosting open houses to help the public gain a better understanding of Freemasonry and to demonstrate the positive impact the fraternity has on its members, their families and their communities. Members will be available to provide tours of their building, talk about Freemasonry’s history, discuss its rituals, signs and symbols, and explain what they do. For more information, visit johnwarrenlodge.org.