In Fond du Lac Walleye weekend has filled lakeside park with music, live events and the smell of fresh food.But one constant from almost the very beginning of the event is the signature walleye sandwiches served up hot by the local Fond du Lac Kiwanis club.Ron Rademann is the president of the club and has been involved in Walleye Weekend since nearly the beginning and says it's truly Fond du Lac tradition."We've been doing the fish here since th…