Prost to Oktoberfest and the season of donning your lederhosen and enjoying live polka music at Brookfield Zoo’s Oktoberfest, presented by Leinenkugel’s. The festive event, which takes place on the Zoo’s East Mall, is free with general admission. In addition to taking in the sounds of Oktoberfest, a seasonal menu featuring bratwursts, sausages, pretzels with beer cheese, and more is available for purchase.