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 established by the Trump administration as a public-private partnership by which to fund and plan events celebrating this summer’s historic anniversary. This week, confusion about the difference between the two groups reached a fever pitch after some of the artists who were billed as performing at Freedom 250’s Great American State Fair backed out, saying they were misled about the nature of the event.…