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 = October festival/party/feast
"Oktoberfest" is a German word, so "Oktoberfest" in German is "Oktoberfest."
You'd say "Willkommen zum Oktoberfest."
Glücklich Oktoberfest!
Oktoberfest!
informal: Du bist zum Oktoberfest am ersten Oktober 2011 eingeladen. formal: Sie sind zum Oktoberfest am ersten Oktober 2011 eingeladen.
OKTOBERFEST
Because the month in which it takes place is october, called "Oktober" in German.
Oktoberfest.
Oktoberfest is celebrated in October.
Assuming you mean "how" to say happy in German, there are a couple of different ways: Froh and gluecklich.
Happy Friday in German is glücklicher Freitag
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!
happy - glücklich Also fröhlich, froh
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.