Redzinner, you can look for 'Herbstfest' or a sort of fall or harvest festival, or 'Schützenfest' which is a marksman festival celebrated in some regions as well. Many towns and villages celebrate them and they are actually quite nice as they are more local and less touristy. I was just in one this past weekend actually in Upper Bavaria
for instance this may help you to find something http://www.herbstfest-international.de/rheinland-pfalz.html. The Schützenfest in Hannover is the largest, but here is a list in English http://en.wikipedia.org/wiki/Schützenfest. I don't know if any run that late, but Neuss (near Düsseldorf) just had theirs, for instance.
Many of the towns in the Rhein area have wine festivals. You can search for 'Weinfest' and the particular town or area.
I hope that helps!
for instance this may help you to find something http://www.herbstfest-international.de/rheinland-pfalz.html. The Schützenfest in Hannover is the largest, but here is a list in English http://en.wikipedia.org/wiki/Schützenfest. I don't know if any run that late, but Neuss (near Düsseldorf) just had theirs, for instance.
Many of the towns in the Rhein area have wine festivals. You can search for 'Weinfest' and the particular town or area.
I hope that helps!