Ask any visitor that involves visit to handle the puppy around; coming in contact with the paws and sense in between the toes; playing with the ears; giving restrained hugs; playing with the mouth area and opening the mouth placing your finger on the puppy's tongue. If at all possible expose your puppy to children and show them how to handle the puppy dog properly. Constantly be sure when children and young dogs are playing alongside one another that they are supervised. You do not want the children to learn too around with the puppy and you don't want the puppy getting so hyped up by antics of children and becomes uncontrollable.
Puppy preschool or kindergarten is a great avenue for socialization with other pet dogs of an identical era. However, the discord arises from the question of doggy vaccinations "could it be safe to have a puppy out during this time?" That is a dilemma because on the one palm you want to train your puppy to be sociable but keep carefully the puppy safe at the same time.