I am trying to find out at what age do you normally start to invite friends from school to birthday parties, instead of just bringing treats to school? My son is turning 2 this september, and yeas early, but I am trying to figure out what to do. He has friends in school, and the students he is friends with their parents are also teachers at the center. So I am not sure if it is inappropiate (or againsit some unwritten center rules). I don't want to put the teachers in an ackward position where they shouldn't come, but our kids are friends, and they should come first.