This week the Historic Districts Council is hosting Preservation Now!, its 19th annual conference on preservation throughout New York City. The keynote and opening night reception are scheduled for this Friday, March 1, and the weekend is full of panels and walking tours. Architectural historian Francis Morrone will take folks through Downtown Brooklyn’s Historic Skyscraper District on Sunday. And a panel scheduled for Saturday, called “Preservation Campaigns and Neighborhoods,” will take on the Williamsburg and Greenpoint rezoning. Students, seniors and friends of HDC get discounts on tickets, which you can purchase right here.