Light show starts on 11-24-2017.
Usually starts around Thanksgiving and goes until New year's. Marshfield, Wisconsin Rotary Wonderland. Look for it on Facebook for specific date posting, nothing was on there yet.
It starts day after thanksgiving
As was said here, it's usually the Friday after thanksgiving. They do have a Facebook page or check the parks department zoo page
They're getting it set up currently.
Thanks! Your answer is awaiting moderation.