How do you teach kids to mingle and learn social interaction?

 Kids have the simplest of minds.  They generally tend to keep to themselves , then how will they socialize, interact and mingle with the other people.?

Very simple,  we indulge them in maximum activities and put them through different Extra curricular activities such as dancing, variety of team sports,etc. Through all this activities, the kids get to talk and get in touch of a lot of people hence they learn to socialize and mingle.