Celebrations are taking place across the country leading up to the 250th anniversary of the adoption of the Declaration of Independence, including concerts, fairs and sporting events, with two main groups responsible for the largest festivities. One of them, America250, is the nonprofit supporting the U.S. Semiquincentennial Commission, which was established 10 years ago through an act of Congress and is led by a bipartisan group of lawmakers and private citizens. The other, Freedom 250, was