According to the Wikipedia :
Oktoberfest (German pronunciation: [ɔkˈtoːbɐˌfɛst]) is the world's largest Volksfest (beer festival and travelling funfair). Held annually in Munich, Bavaria, Germany, it is a 16-day folk festival running from mid or late September to the first weekend in October, with more than 6 million people from around the world attending the event every year. Locally, it is often called the Wiesn, after the colloquial name for the fairgrounds (Theresienwiese). The Oktoberfest is an important part of Bavarian culture, having been held since 1810. Other cities across the world also hold Oktoberfest celebrations that are modeled after the original Munich event.
Well, that kinda says it all, except for one thing. The Oktoberfest is celebrated best, wearing one of the Cardvibes Wiesn designs on a sweater, hoody or T-shirt. So have a look at the Oktoberfest category in the Cardvibes Catalog. Pick a design you like and then a shop to buy it from.