We organised a soccer tournamtent with mixed teams.
Therefore we mixed the genders, the classes within a level so that the kids from the refugee classes played in teams together with the kids from the regular classes.
Before the tournament we started with training units together so that the kids got to know each other and could sort out the ideal position of everyone on the field. Very soon they called each other by name and it didn't matter if one was a boy or a girl, from Syria, Iraq or Germany. The only important thing was the game.