While more of the official Oktoberfest is in September than in October, personal celebrations can continue well past the official end date. In fact, the restaurant mentioned above does not start its celebration until October, and ends well into November.
For another chance to have a German food feast, consider a Christmas party. I once taught in a high school seminary, and the priests who composed most of the faculty had German names. At Christmas they invited me and a few others to a Christmas party, then passed out sheet music in German. Yes, many of our Christmas traditions, especially carols, have German roots, so incorporating a German meal into a Christmas party can be appropriate.
The intro image is our Zazzle product using an image in public domain from W. P. Clipart.