The Association’s 1912 reunion was held at Rolling Green Park in Hummels Wharf near Sunbury, PA. When it eventually closed after hurricane Agnes in 1972 it had a theater (later to become a funhouse) and fireworks every weekend, two roller coasters, dance pavilion, other pavilions, a trolley station and a tilt-a-whirl.
Here are some great links to more information about the park that you can visit.
Daily Item news article HERE.
Susquehanna Life article HERE.
Short video on YouTube of the parks coaster in the 1960s HERE.