An AD happened near the end of the picnic while a non-CPL holder was unloading his firearm so he could enter his vehicle lawfully. He was at the Picnic with some friends and family earlier in the day. This person is not a member of MOC, Inc.
This is why Michigan needs to allow any person that can lawfully own a handgun to carry it loaded in their vehicle. The less a person has to handle their firearm the less chance for an AD.
This is also a cautionary tale to always be careful when handling any firearm. It should be noted that the firearm was pointed in a safe direction (the ground) when it was fired.
That and the info in the article is all I know of at this time.