The Halling Dance is the finale and probably the centerpiece. It is based on traditional Norwegian wedding parties. These parties back in the old country on the family farm, often lasted for six days and drew everybody in from miles around. These multi-day events evolved to have all sorts of things to occupy people's time. The young men of that era worked on what we would call gymnastics today. In fact, one of the moves in this hallingkast dance is a headspin, very much in the same form as what is seen many years later in a sidewalk breakdance.
So come on down to Stoughton, eat some varme pølse, maybe even some lefse, watch a few hats get kicked, and enjoy the dancing that a group of modern day teenagers energetically perform based on old Norwegian traditions.
by the way, there's a great article on wikipedia that talks at length about the wedding dances in the Norway.