PLEASE NOTE: Public fireworks displays are allowed when put on by pyrotechnic professionals and "sponsored by public authorities, fair associations, amusement parks, park boards or civic organizations if a permit for such display is issued by the city."
Click here to see the full ordinance: Sec 44-729 - Public displays, permits and fees.
Per Wis. Stats. § 167.10, the following items do not require a permit: "sparklers not exceeding 36" in length, stationary cones and fountains, toy snakes, smoke bombs, caps, noisemakers, confetti poppers with less than 1/4 grain of explosive mixture, and novelty devices that spin or move on the ground."
Click here to see the full statute on the WI State Legislature site.