http://www.kctv5.com/story/35361557/police-investigating-shooting-incident-near-grandview-community-center
An updated news story said 3 adults and 2 juveniles were arrested and police were pepper-sprayed when they tried to break up the fight. Officers responded from KCMO, Lee's Summit, Belton and Jackson County.
Nothing like a melee to cap off a family event.