The first week of school is generally the period during which students get to know the new members of their class, the subjects in their curriculum, and their teachers. To adjust to the new schedule, many schools prefer to plan some interesting activities for the students. They are meant to make the children comfortable with one another and with the school.
Pick any of these activities for the first week of school or vary them depending on what suits your school/class setting. Make sure that the students have loads of fun, so that they carry this positive spirit throughout the year.