For Public Elementary and Secondary Schools: Do Memo No. 20, s.17 RESOLUTION NO.1091. (Revised Calendar of Activities and Periods of Certain Prohibited Acts in Connection with October 23, 2017 Synchonized barangay &SK Elections) Posted on August 30, 2017 by DepEd Mandaluyong Leave a comment 17-08-132. Do Memo No. 20, s.17RESOLUTION NO.1091.9 (Revised Calendar of Activities and Periods of Certain Prohibited Acts in Connection with October 23, 2017 Synchonized barangay& SK Elections) Memorandum Numbered