I-94 North to Milwaukee. On the South side of Milwaukee, take the 894 bypass around Milwaukee to Highway 45 North, which turns into Highway 41. Take the Johnson Street/Highway 23 West exit in Fond du Lac. Turn left and follow Highway 23 West. Pass through Rosendale (don't exceed the speed limit here!) and Ripon. Approximately seven miles past Ripon, at the top of the rise, turn left on Business 23 (Thrasher Drive). At the first stop sign, go straight. At the second stop sign, turn left onto Mill Street toward downtown Green Lake. The opera house is approximately four blocks ahead. It is located next to a corner BP gas station on the left side of the street.