Honey, I think it's all in how they frame it. Rather than CRUD MONKEYS! SCARY CEMETERY FULL OF DEAD PEOPLE they could say to the parents, "Cemeteries are not only for mourning. They should also be places to celebrate love and family, and we want the children to be encouraged to see it as such. Please bring your children to the (roped off) section and let them socialize and get some candy and treats from family and friends." I don't see a cemetery as automatically a place of horror, death, etc. They are often quite peaceful and quiet, so... I wouldn't be against it, but - maybe poll the parents themselves.