National Constitution week is celebrated this year on September 17-21, 2012.
Visit National Constitutional Center for activities at http://constitutioncenter.org/calendar/constitution-week-programming. The following is from their site:
The Center’s week-long celebration of the U.S. Constitution’s 225th anniversary continues with a wide-variety of interactive programs and on-site activities designed to honor this momentous occasion.
Throughout the week, visitors will put their knowledge to the test during the educational and fun “Bill of Rights” Show and the “Separations of Power” Show.
Guests also will enjoy the Center’s old-fashioned print shop, complete with a replica printing press from the 1700s, and join in calligraphy demonstrations and learn about the Copperplate technique used to pen the official, handwritten Constitution.