It is a big party with music, dancing, and lots of beer-drinking. The traditional music includes polkas and waltzes played by a brass band.
Many places in the world you might find an event called Oktoberfest, that might be one evening, usually in October. The most famous Oktoberfest, in Munich, Germany, runs several days, and starts in September.
I am sure there are Americans of German heritage that celebrate Oktoberfest in the USA, although it's nothing like the festival in Munich.
An Oktoberfest horn is a tuba.
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!
Oktoberfest is as always in October! Prosit!
The largest Oktoberfest takes place in Munich. Oktoberfest is not celebrated outside of the region of Bavaria.
Oktoberfest commemorates the marriage of the first king to a princess.
Germany has the really famous Oktoberfest. There are many local events called Oktoberfest in the United States, and probably in other countries as well.
Wir hatten viel Spaß auf dem Oktoberfest = We had great fun at the Oktoberfest.
There is no name for attendants of Oktoberfest. You might call them Volk or Teilnehmer.
You can say "Bis bald beim Oktoberfest!" in German.
The Oktoberfest in Munich receives approximately 6.5 million annually.