The Great Central Fair of Philadelphia, 1864-- Part 1: A huge Fundraiser for U.S. Sanitary Commission

From  Wikipedia.

The fair took place in June 1864 and was a fundraiser for the United States Sanitary Commission.

Logan Square (now often called Logan Circle) in Philadelphia, Pennsylvania, was the site from June 7-28.  It was inspired by numerous other fundraising fairs that took place across the Union.

The main exhibit was located in a 200,000 square foot hall.  There were numerous smaller structures also.  The whole thing was designed by Samuel Honeyman Kneass and William Strickland.    There was also a Union Street that stretched for 540 feet and ran through the middle of the fair.

--Old SeceshFair