Charlie BreitroseThe Edmund Fowle House, home to the Historical Society of Watertown, will reopen in October. Here, the house hosts the Treaty Day celebration. The Historical Society of Watertown will reopen the Edmund Fowle House for the first time since the pandemic shutdown. To celebrate the group is hosting an open house where the house’s new features can be seen. The Fowle House dates back to 1772, it served as the headquarters of the executive branch of the Massachusetts government from July, 1775 to September, 1776.