For Principals Public/Private Elementary and Secondary School: 3128. AMMENDMENT TO DEPED ORDER NO. 23, S. 2016 Re School Calendar for School Year 2016-2017 Posted on May 13, 2016 by MSM13 Leave a comment 3128. AMMENDMENT TO DEPED ORDER NO. 23, S. 2016 Re School Calendar for School Year 2016-2017 Memorandum