The Henry Ford has a special 36 hour showing of the original copy of the Emancipation Proclamation on loan from the National Archives, starting June 20, 2011 at 6:00 p.m. and continuing until June 22, 2011 at 6:00 a.m.
The original document will only be available to the public for a limited time beginning the evening of Monday, June 20. Following a short opening ceremony, the document will be on display around-the-clock, straight through early Wednesday morning, June 22, when it will return to Washington DC.
This event and Museum admission is free to the public during this time; it's part of the Discovering The Civil War exhibit which runs through September 5.