Here in America ,certainly in my Norwegian neighborhood in Brooklyn, we always called it Independence Day though technically it's Constitution Day. I was in the parade every year as a kid.
Yes, Norwegian roots... my last name is Amundsen. Ring any bells?
I still have relatives in Norway whom I have visited. My mother is fourth generation American but is of 100% Norwegian lineage. My grandfather spoke Norwegian. My father is only 1/2 Norwegian... very sad for him.
May 17 is also my brother's Birthday... we spent May 17 in Bergen one year and the locals treated him royally... FUN!