Lake Martha Days takes place every year over in Osseo, WI and the locals like to describe this beloved event as "family fun with Norwegian flair". Come join in on the fun this year and celebrate everything that the sweet little town of Osseo, WI has to offer! Lake Martha Days is slated to take place June 13-16, 2024 throughout downtown Osseo and will feature a carnival, various food and drinks, a parade, and much more.