There really isnt much for a mini series in wisconsin, but pine ridge raceway in Athelstane wi has a really nice pit bike track. They also do a couple mini races a year, there is one on September 1st. It five dollars a class and you can run as many as you want. Its all for fun and at the end of the season they have a big race called, The Brawl For it all. its a pretty big event and last year there was around 200 bike that came to race. as for the smaller races they usually get like 50 bikes or so. if everything works out in the coming weeks ill be there for both last races.