As families across the nation gather on Thursday, Dec. 25, to celebrate Christmas, Americans should be prepared for a mix of closures and adjusted timings.What's Closed On Christmas?Most federal and financial institutions will pause operations on Thursday. Banks, post offices, and the stock market (NYSE and Nasdaq) are all closed. Major shipping carriers like United Parcel Service Inc. (NYSE:UPS) and FedEx Corp. (NYSE:FDX) will also suspend standard pickup and delivery services.See Also: Trump Hails ‘Record ...