Some schools have clubs where children get to interact with each other doing what they enjoy.  Some of these clubs include sports, chest, dancing, writing and drama etc.  This give student time to engage in doing something they enjoy.  

I think the buddy system is an effective strategy and big brother/big sister system as well that are in place at some school to give support to children who are in a lower grade.  This is done by appointing a child from a higher class with a child from a lower class. They can be with them during break or have someone to talk to or to play with during break and this is done to make them feel safe, special and for support.