Ludwig's--one of my favorite Downtown restaurants--is hosting multiple Oktoberfest celebrations this year. The first couple events are this weekend on September 16th and 17th with an encore next weekend on September 23rd and 24th.
There is food, beer (hopefully in a boot), music, dancing, a best-dressed contest, and a Stein-Holding competition. To get in, you have to purchase a table which allows entry for 6-8 adults. You can buy tickets over here.