Smithsonian Magazine is offering a Free Museum Day Live! on Saturday, September 26th. For one day only, participating museums across the United States will open their doors for free to those who download a Museum Day Live! ticket.
Each ticket grants the ticketholder as well as one guest, free access to any participating museum on September 26th. One ticket is permitted per household and per e-mail address.
You can find a list of participating museums on the Smithsonian site.