(2) On or before July 1, 2013, each school district and each charter school shall establish policies, procedures and guidelines for its school or schools to implement, commencing with the 2013-2014 school year and continuing in each school year thereafter, Dignity Act school employee training programs to promote a positive school environment that is free from harassment, bullying and/or discrimination; and to discourage and respond to incidents of harassment, bullying, and/or discrimination on school property or at a school function, or off school property pursuant to subclause (1)(viii)(c)(iii) of this subdivision. Such polices, procedures and guidelines shall be approved by the board of education, trustees or sole trustee of the school district (or by the chancellor of the city school district, in the case of the City School District of the City of New York) or by the board of trustees of the charter school.