No rules to add, but comment on two prior points:
1. Re the child initiated physical contact, can we add a rider that the child free, and possibly the child-Ed are not dressed in every circumstance to engage with a child. Thinking of a suited fellow, shortly covered in child detritus, and one occasion I was enthusiastically, spontaneously hugged by a child who was engaged in finger painting immediately prior to hugging me. In neither case was there any bad feeling, the suited guy was also a parent, understood, and in my own case, I was wearing clothingg which could be readily washed and not headed to an event where some smudges of hand paint were a problem. It *would* not in either case have reflected well on the parents of the children involved to suggest that any recoiling or avoidance of the children was inappropriate ( neither happened in a specific family/child area, just a common area at a group function where some had children, and brought things to occupy the kids).
2. As a very mature (in years) adult who never had children, but also including my observations of those who did have children, but are well past current small child raising experience, when we do include your children in an invitation to an activity, and especially at our home, please do not assume we understand without your guidance, what may actually be needed in the way of child-proofing or having a child friendly environment. I might get it right, but our collective likelihood of an enjoyable experience will only be heightened by you pointing out or suggesting things which will not automatically occur to me, and I will appreciate pointers.