2015 Chicago Polar Plunge Posted on March 1, 2015 by Chicago 1 Chicago Chicago News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: Thousands of people took to icy Lake Michigan, along with actor Vince Vaughn and singer Lady Gaga, to participate in the 2015 Chicago Polar Plunge 1 Chicago Chicago News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: