I was just reading a tractor club flyer from a club in Maine and one of their prerequisites for any club member exhibiting is that they must have Insurance. 
  .... I am not sure I want to know the answer to this... is this a common requirement?  I don't really want to admit this, but it is probably a smart idea. 
what is the cost of such insurance.... and who would  normally provide this?
 I belong to an active club out here in Connecticut, but have never heard anyone mention this.
 I hope I haven't opened a can of worms here...
                                   Cal