Mt Vernon Dog Park 5 Year Celebration The Mt Vernon Parks and Recreation Department is having a 5 year celebration of the Nancy Doreen Huffman Dog Park, which opened on September 28, 2013. This event will include treats, door prizes, and a dog Halloween costume contest. Share This Page: Date Oct 20 2018 Expired! Time 2:00 pm - 2:00 pm Location Mount Vernon Nature Park - Mount Vernon, Iowa 3rd Street SE Category Family Halloween Neighborhood Outdoor