Eric, congratulations! You have better knowlege of German geography than Germans.
There used to be a Schüttorf festival site in Schüttorf. The first festival there took place in 1981 with The Cure and German New Wave Band Ideal (I was there). The site of the festival has moved at least once, organizers had had various problems and the festival didn't happen for several years.
When the Stones were headliners of the Schüttorf festival (actually a Stones gig with many opening acts), the site had moved to this famous "field in the middle of nowhere", which I think was closer to Bad Bentheim than to Schüttorf.
See website [
www.schuettorffestival.de]
and find the Woodstock type picture from 1981 and some shots from 1995