Strange. At our gym if you leave to go to another gym you generally are not even allowed back IN. We as parents might miss the child and family (or not, depending on the situation) but throwing a party because they are switching gyms...definitely wouldn't happen at our gym. A family might choose to have dinner or something if the family was close with the departing family, but, a party? Hmmm. Again, all I can say is...strange.