The Association's first observance was held on July 3, 1878, drawing a crowd of more than 50,000 people to hear the main speaker for the event, U. S. President Rutherford B. Hayes.
During the three-day visit, President Hayes was accompanied by the U.S. Secretary of the Treasury John Sherman, as well as the U.S. Attorney General Charles Devens.
In 1901, Dr. E. D. Warfield, President of Lafayette College; Dr. William Elliot Griffis in 1903; History Professor Dr. Albert Bushnell Hart of Harvard University in 1906; Hon.
Flood in 1973; Major General Joseph Perugino of the 28th Infantry of the Pennsylvania National Guard in 1995; and Dr. Michael MacDowell, President of Misericordia University in 1999.
The principal speaker at the 2010 observance was Denise Dennis, author and collateral descendant of Revolutionary War soldier Gershom Prince, an African American patriot who was killed during the Battle of Wyoming.