A Zumba Monster Ball will be held at the Jamestown YMCA on Friday, Oct. 25, from 7-8:30 p.m. The YMCA's Zumba instructors will be joining forces to deliver a one-hour 30-minute workout culminating in a rendition of Michael Jackson's "Thriller." The event will also include a costume contest, free individual or group photos and T-shirt shredding from 6-7 p.m. Treats, door and best costume prizes will be provided. Advance registration is required by Thursday, Oct. 24. Cost is $10 for YMCA members and $15 for non-members. For more information and to register visit or call the Jamestown YMCA, 101 E. Fourth St., 664-2802.