Oktoberfest!
You can say "Bis bald beim Oktoberfest!" in German.
If the person is a friend you say: " Wir hoffen dich auf unserem Oktoberfest zu sehen". In a formal context: "Wir hoffen Sie auf unserem Oktoberfest zu sehen". Plural version informal: "Wir hoffen euch auf unserem Oktoberfest zu sehen". Plural formal version: "Wir hoffen Sie auf unserem Oktoberfest zu sehen".
OKTOBERFEST
Because the month in which it takes place is october, called "Oktober" in German.
Oktoberfest.
Oktoberfest is celebrated in October.
Many German cities have an Oktoberfest. Mainly in the south. None last as long as the big one in Munich. Not many would dare to be as expensive either!
I am sure there are Americans of German heritage that celebrate Oktoberfest in the USA, although it's nothing like the festival in Munich.
They traditionally wear the dirndl.
informal: Du bist zum Oktoberfest am ersten Oktober 2011 eingeladen. formal: Sie sind zum Oktoberfest am ersten Oktober 2011 eingeladen.
Type your answer here... Germany does with festivals and many traditional foods.