Use to go to the Neewollah Celebrations as a child
They were held in the playright William Inge's hometown of Independence, KS. My aunt, uncle, and cousin lived there, and my family always came for the celebrations when I was growing up. Lots of fun!
I'm thinking it was around the end of October, unlike the movie, which was Labor Day - first part of September.
I may be wrong, but I seem to remember reading somewhere that William Inge based many of his stories - Picnic, Splendor in the Grass, etc. - in the Kansas locale where he grew up.