Do they still celebrate Syttende Mai in Stoughton, Wisconsin? They did when I was kid growing up in nearby Middleton, WI. We had our own summertime festival called "The Good Neighbor Festival, " always around the last weekend of summer. Other small communities had theirs too: Sun Prairie had their "Corn Festival." Waunakee had something called "Volksfest," but that went away. Now I understand they celebrate "Wauktober Fest"? Perhaps Titus can enlighten us. Jefferson, WI had "Gemuetlickeit Days;" Madison had "May Day" (I kid).
The names suggest a strong European influence which I think is waning fast.
Do people do these kinds of things outside of Wisconsin?