CALUMET COUNTY, Wis. (WLUK) -- Lake Winnebago is buzzing yet again. “There’s this buzzing, like there’s a beehive or something!” said Cheryl Hauswirth of Grafton, Wis. No, it’s not a swarm of bees you hear at Calumet County Park, it’s that time of year - the invasion of our pesky little friends, the lake flies, and they are all over the shorelines and campgrounds.