Open House New York returns for another year of fun events—plus more things to do this weekend in Harlem and beyond. Open House New York Weekend Friday, October 17-Sunday, October 19 FREE Various locations Here's your chance to go on behind-the-scenes tours of 270+ gems across the city, including uptown wonders like the Mount Morris Fire Watchtower and the Historic Cottage at Fort Tryon Park. Other fun drop-in events include the Dia de los Muertos celebration at the Hispanic